CVE-2025-2653: Qianfox Foxcms Authorization Bypass Flaw

CVE-2025-2653 Overview

CVE-2025-2653 is an improper authorization vulnerability affecting FoxCMS version 1.25, developed by Qianfox. The flaw allows a remote attacker with low-level privileges to abuse unknown functionality that fails to enforce proper authorization checks. Exploitation requires network access and authenticated low-privilege access, but no user interaction. The vulnerability maps to [CWE-266] Incorrect Privilege Assignment. Public disclosure of the exploit technique has occurred through third-party security documentation, increasing the risk of opportunistic attacks against unpatched FoxCMS deployments.

Critical Impact

Authenticated attackers can bypass authorization controls in FoxCMS 1.25 remotely, leading to limited integrity impact on affected content management systems.

Affected Products

• Qianfox FoxCMS 1.25
• Deployments exposing the FoxCMS web interface to untrusted networks
• Any environment where low-privileged user accounts can reach the affected functionality

Discovery Timeline

• 2025-03-23 - CVE-2025-2653 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-2653

Vulnerability Analysis

The vulnerability stems from improper authorization enforcement within FoxCMS 1.25. An authenticated attacker with low privileges can invoke functionality that should require higher privileges or a different user context. The affected functionality is not publicly identified in the advisory, but the categorization under [CWE-266] indicates that privileges are assigned incorrectly to roles or users. The attack can be launched remotely over the network without user interaction. Public exploit details have been disclosed through third-party security documentation, lowering the barrier to exploitation. The scope is limited to integrity impact, with no direct confidentiality or availability consequences reported.

Root Cause

FoxCMS 1.25 fails to validate that the authenticated principal holds the required role or ownership before executing a privileged action. This authorization gap is characteristic of [CWE-266], where the application grants permissions beyond what the user's role should allow.

Attack Vector

An attacker authenticates to FoxCMS with any low-privilege account and sends a crafted HTTP request to the vulnerable endpoint. Because authorization checks are missing or incomplete, the server processes the request as if the user were authorized. No social engineering or client-side interaction is required. Refer to the VulDB CTI Report #300668 and the Yuque Security Document for additional technical context.

No verified proof-of-concept code is published in a trusted exploit repository. The disclosure describes the mechanism in prose rather than providing working exploit code.

Detection Methods for CVE-2025-2653

Indicators of Compromise

• Unexpected successful HTTP requests to administrative or privileged FoxCMS endpoints originating from low-privilege user sessions.
• Modifications to CMS content, configuration, or user records that cannot be attributed to a legitimate administrator action.
• Access patterns where the same session identifier transitions from standard user actions to privileged operations without an intervening role change.

Detection Strategies

• Review FoxCMS access logs for authenticated requests to administrative routes performed by accounts that lack administrator roles.
• Correlate web server logs with application audit trails to identify authorization decisions that permit actions inconsistent with the user's assigned role.
• Deploy web application firewall rules that flag requests to sensitive FoxCMS paths from non-administrative session cookies.

Monitoring Recommendations

• Enable verbose authorization logging in FoxCMS and forward events to a centralized SIEM for correlation.
• Alert on anomalous request volume or newly observed endpoints accessed by low-privilege accounts.
• Monitor for configuration or content changes outside approved change windows and tie them back to the originating session.

How to Mitigate CVE-2025-2653

Immediate Actions Required

• Identify all FoxCMS 1.25 instances in your environment and restrict network exposure to trusted administrators where feasible.
• Audit existing user accounts and disable or reduce privileges on accounts that are not actively required.
• Rotate credentials for low-privilege accounts that may have been used to probe or exploit the affected functionality.

Patch Information

No vendor advisory URL is listed in the CVE record for CVE-2025-2653. Administrators should monitor the Qianfox FoxCMS project and vendor channels for a security update that addresses the [CWE-266] authorization flaw in version 1.25. Until a vendor patch is published, treat all FoxCMS 1.25 deployments as vulnerable.

Workarounds

• Place FoxCMS behind a reverse proxy or VPN and restrict access to administrative paths to known IP ranges.
• Enforce strong authentication requirements and remove or disable unused low-privilege accounts.
• Implement external authorization checks at the reverse proxy layer that validate the requested path against the authenticated user's role.

# Example nginx snippet restricting FoxCMS admin paths to trusted IPs
location ~* ^/(admin|install|setup) {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://foxcms_backend;
}