CVE-2025-5655: PHPGurukul CMS SQL Injection Vulnerability

CVE-2025-5655 Overview

CVE-2025-5655 is a SQL injection vulnerability in PHPGurukul Complaint Management System 2.0. The flaw resides in the /admin/edit-subcategory.php file, where the subcategory parameter is passed directly into a SQL query without proper sanitization. Authenticated attackers can manipulate this parameter remotely to inject arbitrary SQL statements. The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output). Public disclosure of exploitation details has occurred through VulDB #311145 Report and a GitHub Issue Discussion, increasing the likelihood of opportunistic abuse against unpatched deployments.

Critical Impact

Authenticated remote attackers can inject arbitrary SQL through the subcategory parameter, potentially exposing or modifying complaint records and administrative data.

Affected Products

• PHPGurukul Complaint Management System 2.0
• Deployments using the admin/edit-subcategory.php administrative endpoint
• Web applications based on the unpatched PHPGurukul codebase

Discovery Timeline

• 2025-06-05 - CVE-2025-5655 published to NVD
• 2025-06-10 - Last updated in NVD database

Technical Details for CVE-2025-5655

Vulnerability Analysis

The vulnerability stems from the administrative subcategory editor in PHPGurukul Complaint Management System 2.0. The edit-subcategory.php script accepts the subcategory argument from user-controlled input and incorporates it into an SQL statement without parameterization or sanitization. An attacker with administrative session access can submit crafted payloads that alter query logic. Successful exploitation can yield unauthorized read or write access to the underlying MySQL database supporting the complaint management workflows.

The vulnerability requires network reachability to the admin interface and low-privilege authentication. Once authenticated, exploitation requires no user interaction. The flaw aligns with CWE-74, reflecting improper neutralization of special elements passed into a downstream interpreter.

Root Cause

The root cause is the absence of prepared statements or input validation around the subcategory parameter. The PHP code concatenates the parameter directly into a SQL UPDATE or SELECT query string. Standard SQL meta-characters such as single quotes, comments, and UNION keywords are passed through unchanged, allowing query structure manipulation.

Attack Vector

An attacker authenticates to the admin panel and issues a POST or GET request to /admin/edit-subcategory.php containing a malicious payload in the subcategory field. Common techniques include boolean-based blind injection, time-based blind injection using SLEEP(), and UNION-based extraction of database tables. Because the endpoint is reachable over HTTP, exploitation is feasible from any networked host with valid admin credentials. Brute-forced or default administrator credentials may further lower the barrier to exploitation.

No verified public exploit code is referenced in the advisory. Technical details are available in the VulDB #311145 Details entry and the associated GitHub Issue Discussion.

Detection Methods for CVE-2025-5655

Indicators of Compromise

• HTTP requests to /admin/edit-subcategory.php containing SQL meta-characters such as ', --, UNION, SLEEP(, or INFORMATION_SCHEMA in the subcategory parameter.
• Unexpected UPDATE or SELECT activity in MySQL query logs originating from the complaint management application user.
• Web server access logs showing repeated POST requests to the subcategory editor from a single source within short intervals.

Detection Strategies

• Deploy web application firewall (WAF) rules targeting SQL injection signatures on parameters submitted to /admin/edit-subcategory.php.
• Enable MySQL general query logging and alert on syntactically anomalous statements referencing the subcategory table.
• Correlate admin authentication events with subsequent parameter tampering attempts to identify credentialed abuse.

Monitoring Recommendations

• Forward web server, application, and database logs to a centralized analytics platform for cross-source correlation.
• Baseline normal administrator behavior against the subcategory editor and alert on deviations such as bulk edits or off-hours activity.
• Monitor outbound database connections for unusual data volumes that may indicate exfiltration via injection.

How to Mitigate CVE-2025-5655

Immediate Actions Required

• Restrict access to /admin/ paths using IP allowlists, VPN gating, or reverse proxy authentication until a code fix is applied.
• Rotate administrator credentials and audit existing admin accounts for unauthorized additions.
• Review database audit logs for evidence of injection attempts dating back to the application's deployment.

Patch Information

No official vendor patch is referenced in the available advisories at the time of publication. Operators should track PHP Gurukul Resource for vendor updates and review the VulDB #311145 Report for remediation guidance. In the absence of a patch, application owners should manually modify edit-subcategory.php to use parameterized queries via mysqli_prepare() or PDO with bound parameters.

Workarounds

• Replace string concatenation in edit-subcategory.php with prepared statements that bind the subcategory value as a typed parameter.
• Implement server-side input validation that rejects non-alphanumeric characters in the subcategory field where business logic permits.
• Deploy a WAF with managed SQL injection rulesets in front of the application to block known payload patterns.
• Disable or remove the complaint management subcategory editing feature if it is not in active use.

# Example mod_security rule to block SQLi patterns on the affected endpoint
SecRule REQUEST_URI "@contains /admin/edit-subcategory.php" \
    "id:1005655,phase:2,deny,status:403,\
    chain,msg:'CVE-2025-5655 SQLi attempt blocked'"
    SecRule ARGS:subcategory "@rx (?i)(union(\s|\+)+select|sleep\(|--|';|/\*)"