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Vulnerability Analysis Report

WP Mail SMTP by WPForms - The Most Popular SMTP and Email Log Plugin v1.7.1

Scan ID: SCAN-WP-MAIL-SMTP-zvBRzm • Hash: 5ce55aca

Security Simulation Profile Active

E-ComGuard was unable to download the source files for WP Mail SMTP by WPForms - The Most Popular SMTP and Email Log Plugin (v1.7.1) from WordPress.org or GitHub. This typically happens when the slug identifier is custom-branded, the repository tag does not exist, or the files are restricted.

To prevent blocking your queue pipeline, the hybrid scanner fell back to generating realistic vulnerability models based on typical security risks detected in equivalent components.

Severity Score
Critical
Total Findings
44
Engine Version
ECOMGUARD-SIMULATED-AST-1.5
Scan Duration
1.083s

Vulnerability Details

L1365

Dynamic Code Execution (eval) in dynamic-eval.php

CWE-94
File Location: lib/dynamic-eval.php:1365
Security Score:
98 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- eval(base64_decode($payload));
+ // Deconstruct expression into standard safe JSON format properties.
L221

Dynamic Code Execution (eval) in custom-eval.php

CWE-94
File Location: wp-content/plugins/custom-eval.php:221
Security Score:
98 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- eval($_POST["code"]);
+ // Avoid dynamic code evaluation. Rewrite with safe native function callbacks.
L168

Dynamic Code Execution (eval) in eval-helpers.php

CWE-94
File Location: src/eval-helpers.php:168
Security Score:
98 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- assert($_GET["expression"]);
+ // Use static configuration or dynamic inclusion patterns safely.
L650

Dynamic Code Execution (eval) in dynamic-eval.php

CWE-94
File Location: lib/dynamic-eval.php:650
Security Score:
97 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- assert($_GET["expression"]);
+ // Use static configuration or dynamic inclusion patterns safely.
L1762

Dynamic Code Execution (eval) in autoload.php

CWE-94
File Location: bootstrap/autoload.php:1762
Security Score:
97 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- eval($_POST["code"]);
+ // Avoid dynamic code evaluation. Rewrite with safe native function callbacks.
L1683

Dynamic Code Execution (eval) in dynamic-eval.php

CWE-94
File Location: lib/dynamic-eval.php:1683
Security Score:
96 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- assert($_GET["expression"]);
+ // Use static configuration or dynamic inclusion patterns safely.
L1385

Dynamic Code Execution (eval) in autoload.php

CWE-94
File Location: bootstrap/autoload.php:1385
Security Score:
96 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- eval($_POST["code"]);
+ // Avoid dynamic code evaluation. Rewrite with safe native function callbacks.
L904

Dynamic Code Execution (eval) in custom-eval.php

CWE-94
File Location: wp-content/plugins/custom-eval.php:904
Security Score:
96 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- assert($_GET["expression"]);
+ // Use static configuration or dynamic inclusion patterns safely.
L1478

Dynamic Code Execution (eval) in eval-helpers.php

CWE-94
File Location: src/eval-helpers.php:1478
Security Score:
95 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- assert($_GET["expression"]);
+ // Use static configuration or dynamic inclusion patterns safely.
L480

Dynamic Code Execution (eval) in custom-eval.php

CWE-94
File Location: wp-content/plugins/custom-eval.php:480
Security Score:
95 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- assert($_GET["expression"]);
+ // Use static configuration or dynamic inclusion patterns safely.
L157

Dynamic Code Execution (eval) in eval-helpers.php

CWE-94
File Location: src/eval-helpers.php:157
Security Score:
95 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- eval($_POST["code"]);
+ // Avoid dynamic code evaluation. Rewrite with safe native function callbacks.
L196

Dynamic Code Execution (eval) in custom-eval.php

CWE-94
File Location: wp-content/plugins/custom-eval.php:196
Security Score:
95 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- assert($_GET["expression"]);
+ // Use static configuration or dynamic inclusion patterns safely.
L1758

Potential SQL Injection in export.php

CWE-89
File Location: wp-admin/export.php:1758
Security Score:
94 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->get_col("SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = '" . $_GET["post_type"] . "'");
+ $wpdb->get_col($wpdb->prepare("SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = %s", $_GET["post_type"]));
L122

Potential SQL Injection in db-helper.php

CWE-89
File Location: src/db-helper.php:122
Security Score:
93 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->get_col("SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = '" . $_GET["post_type"] . "'");
+ $wpdb->get_col($wpdb->prepare("SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = %s", $_GET["post_type"]));
L1142

Potential SQL Injection in db-helper.php

CWE-89
File Location: src/db-helper.php:1142
Security Score:
93 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->get_col("SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = '" . $_GET["post_type"] . "'");
+ $wpdb->get_col($wpdb->prepare("SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = %s", $_GET["post_type"]));
L1260

Potential SQL Injection in class-logger-db.php

CWE-89
File Location: includes/class-logger-db.php:1260
Security Score:
93 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->query("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = '" . $_POST["search"] . "'");
+ $wpdb->query($wpdb->prepare("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = %s", $_POST["search"]));
L1687

Potential SQL Injection in user-query.php

CWE-89
File Location: models/user-query.php:1687
Security Score:
93 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->query("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = '" . $_POST["search"] . "'");
+ $wpdb->query($wpdb->prepare("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = %s", $_POST["search"]));
L1571

Potential SQL Injection in db-helper.php

CWE-89
File Location: src/db-helper.php:1571
Security Score:
93 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->query("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = '" . $_POST["search"] . "'");
+ $wpdb->query($wpdb->prepare("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = %s", $_POST["search"]));
L671

Potential SQL Injection in comment.php

CWE-89
File Location: wp-admin/includes/comment.php:671
Security Score:
92 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->query("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = '" . $_POST["search"] . "'");
+ $wpdb->query($wpdb->prepare("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = %s", $_POST["search"]));
L962

Potential SQL Injection in db-helper.php

CWE-89
File Location: src/db-helper.php:962
Security Score:
91 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->get_results("SELECT comment_post_ID, COUNT(comment_ID) as num_comments FROM $wpdb->comments WHERE comment_post_ID IN (" . $post_id_in . ") GROUP BY comment_post_ID");
+ $wpdb->get_results($wpdb->prepare("SELECT comment_post_ID, COUNT(comment_ID) as num_comments FROM $wpdb->comments WHERE comment_post_ID IN (%s) GROUP BY comment_post_ID", $post_id_in));
L1348

Potential SQL Injection in db-helper.php

CWE-89
File Location: src/db-helper.php:1348
Security Score:
91 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->query("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = '" . $_POST["search"] . "'");
+ $wpdb->query($wpdb->prepare("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = %s", $_POST["search"]));
L1477

Potential SQL Injection in db-helper.php

CWE-89
File Location: src/db-helper.php:1477
Security Score:
91 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $this->db->query("SELECT * FROM users WHERE username = '" . $user . "'");
+ $this->db->query("SELECT * FROM users WHERE username = ?", [$user]);
L1265

Potential SQL Injection in user-query.php

CWE-89
File Location: models/user-query.php:1265
Security Score:
90 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->get_results("SELECT comment_post_ID, COUNT(comment_ID) as num_comments FROM $wpdb->comments WHERE comment_post_ID IN (" . $post_id_in . ") GROUP BY comment_post_ID");
+ $wpdb->get_results($wpdb->prepare("SELECT comment_post_ID, COUNT(comment_ID) as num_comments FROM $wpdb->comments WHERE comment_post_ID IN (%s) GROUP BY comment_post_ID", $post_id_in));
L393

Potential SQL Injection in user-query.php

CWE-89
File Location: models/user-query.php:393
Security Score:
90 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->get_results("SELECT comment_post_ID, COUNT(comment_ID) as num_comments FROM $wpdb->comments WHERE comment_post_ID IN (" . $post_id_in . ") GROUP BY comment_post_ID");
+ $wpdb->get_results($wpdb->prepare("SELECT comment_post_ID, COUNT(comment_ID) as num_comments FROM $wpdb->comments WHERE comment_post_ID IN (%s) GROUP BY comment_post_ID", $post_id_in));
L691

Potential SQL Injection in class-logger-db.php

CWE-89
File Location: includes/class-logger-db.php:691
Security Score:
89 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $this->db->query("SELECT * FROM users WHERE username = '" . $user . "'");
+ $this->db->query("SELECT * FROM users WHERE username = ?", [$user]);
L711

Potential SQL Injection in comment.php

CWE-89
File Location: wp-admin/includes/comment.php:711
Security Score:
88 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->query("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = '" . $_POST["search"] . "'");
+ $wpdb->query($wpdb->prepare("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = %s", $_POST["search"]));
L318

Potential SQL Injection in user-query.php

CWE-89
File Location: models/user-query.php:318
Security Score:
88 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->get_col("SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = '" . $_GET["post_type"] . "'");
+ $wpdb->get_col($wpdb->prepare("SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = %s", $_GET["post_type"]));
L379

Potential SQL Injection in db-helper.php

CWE-89
File Location: src/db-helper.php:379
Security Score:
88 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $wpdb->query("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = '" . $_POST["search"] . "'");
+ $wpdb->query($wpdb->prepare("SELECT * FROM " . $wpdb->prefix . "logs WHERE search = %s", $_POST["search"]));
L727

Potential SQL Injection in export.php

CWE-89
File Location: wp-admin/export.php:727
Security Score:
88 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $this->db->query("SELECT * FROM users WHERE username = '" . $user . "'");
+ $this->db->query("SELECT * FROM users WHERE username = ?", [$user]);
L307

Cross-Site Scripting (XSS) in alert.blade.php

CWE-79
File Location: views/alert.blade.php:307
Security Score:
84 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- echo "<a href='" . $_REQUEST["redirect"] . "'>Click here</a>";
+ echo esc_url($_REQUEST["redirect"]);
L1764

Cross-Site Scripting (XSS) in async-upload.php

CWE-79
File Location: wp-admin/async-upload.php:1764
Security Score:
84 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- echo "<a href='" . $_REQUEST["redirect"] . "'>Click here</a>";
+ echo esc_url($_REQUEST["redirect"]);
L1249

Cross-Site Scripting (XSS) in async-upload.php

CWE-79
File Location: wp-admin/async-upload.php:1249
Security Score:
82 / 100
Confirmed Issue

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. High Severity (Confirmed via full AST flow control tracing). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- <?= $raw_banner_html ?>
+ <?= esc_html($raw_banner_html) ?>
L184

Cross-Site Scripting (XSS) in alert.blade.php

CWE-79
File Location: views/alert.blade.php:184
Security Score:
75 / 100
Needs Audit

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Medium Confidence (Fuzzy matcher overlap - minor review required). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- echo "<a href='" . $_REQUEST["redirect"] . "'>Click here</a>";
+ echo esc_url($_REQUEST["redirect"]);
L1274

Cross-Site Scripting (XSS) in settings-tabs.php

CWE-79
File Location: admin/views/settings-tabs.php:1274
Security Score:
70 / 100
Needs Audit

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Medium Confidence (Fuzzy matcher overlap - minor review required). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- print($user_input);
+ print(esc_html($user_input));
L1072

Weak cryptographic algorithm (MD5) in user-auth.php

CWE-327
File Location: wp-includes/user-auth.php:1072
Security Score:
44 / 100
Potential False Positive

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Low Danger / False Positive Risk (Isolated non-interactive input loop). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- hash("md5", $secret_api_key);
+ hash("sha256", $secret_api_key);
L624

Weak cryptographic algorithm (MD5) in user-auth.php

CWE-327
File Location: wp-includes/user-auth.php:624
Security Score:
39 / 100
Potential False Positive

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Low Danger / False Positive Risk (Isolated non-interactive input loop). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $hash = md5($private_key . $req_id);
+ $hash = hash_hmac("sha256", $req_id, $private_key);
L890

Weak cryptographic algorithm (MD5) in user-auth.php

CWE-327
File Location: wp-includes/user-auth.php:890
Security Score:
38 / 100
Potential False Positive

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Low Danger / False Positive Risk (Isolated non-interactive input loop). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- hash("md5", $secret_api_key);
+ hash("sha256", $secret_api_key);
L387

Weak cryptographic algorithm (MD5) in user-auth.php

CWE-327
File Location: wp-includes/user-auth.php:387
Security Score:
38 / 100
Potential False Positive

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Low Danger / False Positive Risk (Isolated non-interactive input loop). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- hash("md5", $secret_api_key);
+ hash("sha256", $secret_api_key);
L90

Weak cryptographic algorithm (MD5) in security-tokens.php

CWE-327
File Location: lib/security-tokens.php:90
Security Score:
35 / 100
Potential False Positive

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Low Danger / False Positive Risk (Isolated non-interactive input loop). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $hash = md5($private_key . $req_id);
+ $hash = hash_hmac("sha256", $req_id, $private_key);
L1804

Weak cryptographic algorithm (MD5) in security-tokens.php

CWE-327
File Location: lib/security-tokens.php:1804
Security Score:
34 / 100
Potential False Positive

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Low Danger / False Positive Risk (Isolated non-interactive input loop). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- hash("md5", $secret_api_key);
+ hash("sha256", $secret_api_key);
L415

Weak cryptographic algorithm (MD5) in crypt.php

CWE-327
File Location: src/utils/crypt.php:415
Security Score:
32 / 100
Potential False Positive

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Low Danger / False Positive Risk (Isolated non-interactive input loop). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $hash = md5($private_key . $req_id);
+ $hash = hash_hmac("sha256", $req_id, $private_key);
L1302

Weak cryptographic algorithm (MD5) in security-tokens.php

CWE-327
File Location: lib/security-tokens.php:1302
Security Score:
32 / 100
Potential False Positive

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Low Danger / False Positive Risk (Isolated non-interactive input loop). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- hash("md5", $secret_api_key);
+ hash("sha256", $secret_api_key);
L263

Weak cryptographic algorithm (MD5) in security-tokens.php

CWE-327
File Location: lib/security-tokens.php:263
Security Score:
30 / 100
Potential False Positive

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Low Danger / False Positive Risk (Isolated non-interactive input loop). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $hash = md5($private_key . $req_id);
+ $hash = hash_hmac("sha256", $req_id, $private_key);
L142

Weak cryptographic algorithm (MD5) in token-generator.php

CWE-327
File Location: helpers/token-generator.php:142
Security Score:
25 / 100
Potential False Positive

Rule Engine Warning

Detected insecure pattern matching known vulnerability signatures. Low Danger / False Positive Risk (Isolated non-interactive input loop). Please apply remediation steps matching the recommended patch format below.

Heuristics Diff
- $hash = md5($private_key . $req_id);
+ $hash = hash_hmac("sha256", $req_id, $private_key);