CVE-2025-52023 Overview
A vulnerability in the PHP backend of GEMS CMS (gemscms.aptsys.com.sg) through 2025-05-28 allows unauthenticated remote attackers to trigger detailed error messages that disclose internal file paths, code snippets, and stack traces. This occurs when specially crafted HTTP GET/POST requests are sent to public API endpoints, exposing potentially sensitive information useful for further exploitation. This issue is classified under CWE-209: Information Exposure Through an Error Message.
Critical Impact
Unauthenticated attackers can harvest internal system information including file paths, code snippets, and stack traces to facilitate further attacks against the application.
Affected Products
- GEMS CMS (gemscms.aptsys.com.sg) through 2025-05-28
Discovery Timeline
- 2026-01-23 - CVE-2025-52023 published to NVD
- 2026-01-26 - Last updated in NVD database
Technical Details for CVE-2025-52023
Vulnerability Analysis
This vulnerability represents a classic information disclosure flaw where the PHP backend fails to properly sanitize error output in production environments. When the application encounters unexpected input or processing errors, it reveals verbose debugging information instead of generic error messages.
The exposed information typically includes absolute file system paths (revealing server directory structure), partial source code snippets from error-triggering functions, complete PHP stack traces showing function call chains, database connection strings or query fragments, and internal variable states at the time of error.
This type of information leakage serves as a reconnaissance tool for attackers, enabling them to map the application's internal architecture and identify additional attack surfaces.
Root Cause
The root cause stems from improper error handling configuration in the PHP backend. Production environments should have display_errors disabled and implement custom error handlers that log detailed information server-side while presenting only generic messages to users. The GEMS CMS implementation exposes raw PHP error output directly to HTTP responses, violating secure coding practices defined in CWE-209.
Attack Vector
The attack is network-accessible and requires no authentication or user interaction. Attackers can craft malformed HTTP GET or POST requests targeting public API endpoints. By submitting unexpected parameter types, oversized inputs, or specially formatted payloads, attackers can trigger application errors that expose internal details.
The disclosed information enables attackers to understand the technology stack and framework versions, identify potential file inclusion or path traversal targets, map database schema through query error messages, and locate additional vulnerable endpoints based on stack traces. For technical details, see the GitHub Gist Exploit Code.
Detection Methods for CVE-2025-52023
Indicators of Compromise
- HTTP responses containing PHP stack traces, file paths (e.g., /var/www/, /home/), or function names
- Error messages revealing database query syntax or connection details
- Responses with Fatal error:, Warning:, Notice: PHP error prefixes
- Unusual patterns of malformed requests targeting multiple API endpoints in rapid succession
Detection Strategies
- Implement web application firewall (WAF) rules to detect and block responses containing PHP error signatures
- Monitor server logs for high volumes of 500-series HTTP status codes from single source IPs
- Deploy application-layer intrusion detection to identify reconnaissance patterns against API endpoints
- Review HTTP response bodies for inadvertent disclosure of server paths or stack traces
Monitoring Recommendations
- Enable alerting on HTTP responses exceeding typical size that contain error keywords
- Track and correlate failed requests across API endpoints to identify scanning activity
- Implement rate limiting on public API endpoints to slow reconnaissance attempts
- Monitor for requests with unusual parameter formats designed to trigger errors
How to Mitigate CVE-2025-52023
Immediate Actions Required
- Disable PHP error display in production by setting display_errors = Off in php.ini
- Configure custom error handlers that log details server-side and return generic user messages
- Review and harden API endpoint input validation to reject malformed requests before processing
- Implement rate limiting to slow automated scanning and exploitation attempts
Patch Information
No vendor patch information is currently available for this vulnerability. Organizations should implement the workarounds below and monitor the APTSys Security Overview and GEMS CMS Resource for updates.
Workarounds
- Set display_errors = Off and log_errors = On in PHP configuration immediately
- Implement a custom error handler that sanitizes all output before sending to clients
- Deploy a web application firewall with rules to strip sensitive information from error responses
- Consider placing affected endpoints behind authentication until a patch is available
# PHP configuration hardening example
# Add to php.ini or .htaccess
# Disable error display to users
display_errors = Off
# Enable error logging to secure location
log_errors = On
error_log = /var/log/php/error.log
# Set appropriate error reporting level
error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
