CVE-2026-41931: Vvveb Information Disclosure Vulnerability

CVE-2026-41931 Overview

CVE-2026-41931 is an information disclosure vulnerability in the Vvveb content management system before version 1.0.8.2. The flaw resides in the admin password-reset module, where a missing namespace import triggers an unhandled exception. The debug exception handler then renders sensitive server details to unauthenticated requests. Exposed data includes absolute server file paths, internal class namespaces, line numbers, and source code excerpts. The weakness is classified under CWE-209: Generation of Error Message Containing Sensitive Information.

Critical Impact

Unauthenticated remote attackers can obtain server-side file paths, namespaces, and source code fragments by sending a single request to the admin password-reset endpoint, enabling reconnaissance for follow-on attacks.

Affected Products

• Vvveb CMS versions before 1.0.8.2
• Vvveb admin password-reset module
• Vvveb debug exception handler component

Discovery Timeline

• 2026-05-06 - CVE-2026-41931 published to NVD
• 2026-05-06 - Last updated in NVD database

Technical Details for CVE-2026-41931

Vulnerability Analysis

The vulnerability is an information disclosure issue rooted in error handling within the Vvveb password-reset workflow. When an unauthenticated user accesses the admin password-reset endpoint, the application attempts to invoke a class without the required namespace import. PHP raises a fatal error, which is caught by the framework's debug exception handler. Instead of returning a generic error response, the handler renders a verbose stack trace to the requester. The response includes the absolute filesystem path of the application, internal class namespaces, line numbers, and excerpts of source code surrounding the failure point. Because the endpoint requires no authentication, any remote actor can reproduce the disclosure with a single HTTP request.

Root Cause

The root cause combines two defects. First, a missing namespace use statement in the password-reset controller causes an unhandled exception at runtime. Second, the production deployment exposes the framework's debug exception handler to unauthenticated traffic. The exception handler is intended for development and emits detailed diagnostic output that should never reach untrusted clients. The combination makes the disclosure reliably reproducible by any attacker who knows the endpoint path.

Attack Vector

Exploitation requires only network access to the Vvveb administrative interface. An attacker issues an HTTP request to the admin password-reset endpoint and parses the returned debug page. No credentials, user interaction, or special tooling are required. The disclosed paths and source excerpts assist attackers in fingerprinting the installation, mapping the codebase, and identifying additional weaknesses such as include-path issues, writable directories, or chained injection points. Refer to the VulnCheck Vvveb Information Disclosure Advisory and the GitHub Security Advisory GHSA-xgvg-r47g-786r for technical detail.

Detection Methods for CVE-2026-41931

Indicators of Compromise

• Unauthenticated HTTP requests to the Vvveb admin password-reset endpoint originating from unfamiliar IP addresses.
• HTTP 500 responses from the password-reset endpoint containing stack-trace markup or absolute filesystem paths.
• Web server or PHP error logs recording fatal errors referencing missing class namespaces in the password-reset module.
• Outbound reconnaissance scans following anomalous responses from the admin interface.

Detection Strategies

• Inspect web access logs for requests to the password-reset URL paths from non-administrator source IPs.
• Alert on response bodies that include strings such as Stack trace, Fatal error, or absolute paths like /var/www/.
• Correlate elevated 500-status responses on Vvveb administrative routes with subsequent enumeration of additional endpoints.
• Compare the deployed Vvveb version against the fixed release 1.0.8.2 during routine asset inventory checks.

Monitoring Recommendations

• Enable verbose web application firewall logging for all admin paths and forward events to a centralized SIEM.
• Monitor PHP error logs for repeated unhandled exceptions and treat them as triage signals.
• Track outbound traffic from the web server for follow-on activity that may indicate post-disclosure exploitation attempts.

How to Mitigate CVE-2026-41931

Immediate Actions Required

• Upgrade Vvveb to version 1.0.8.2 or later, available through the GitHub Vvveb Release 1.0.8.2.
• Disable debug or development mode in any production Vvveb deployment so that exception handlers never render diagnostic content to clients.
• Restrict access to administrative endpoints by IP allowlist, VPN, or authenticated reverse proxy until the patch is applied.
• Review web server logs for prior unauthenticated requests to the password-reset endpoint and assess potential reconnaissance exposure.

Patch Information

The Vvveb maintainers addressed CVE-2026-41931 in release 1.0.8.2. The fix adds the missing namespace import in the password-reset controller and prevents the debug exception handler from rendering sensitive diagnostic data to unauthenticated requests. Full details are available in the GitHub Security Advisory GHSA-xgvg-r47g-786r.

Workarounds

• Configure PHP with display_errors=Off and route errors only to server-side log files.
• Place the admin interface behind authentication at the web server or reverse proxy layer until the upgrade is completed.
• Deploy a web application firewall rule that blocks responses containing stack-trace signatures from the affected endpoint.

# Configuration example: disable verbose PHP error output in production
sed -i 's/^display_errors\s*=.*/display_errors = Off/' /etc/php/php.ini
sed -i 's/^display_startup_errors\s*=.*/display_startup_errors = Off/' /etc/php/php.ini
sed -i 's/^log_errors\s*=.*/log_errors = On/' /etc/php/php.ini
systemctl restart php-fpm