Overview
A security vulnerability has been identified in FeehiCMS version 2.1.1, tracked as CVE-2025-63523. This flaw allows an authenticated attacker to bypass intended server-side immutability for parameters presented to the client as “read-only.” By intercepting and modifying these parameters during transit, the attacker can trick the backend into accepting the changes, potentially leading to unintended username modifications.
Technical Details
FeehiCMS 2.1.1 fails to properly enforce server-side immutability on certain user-related parameters. These parameters are intended to be read-only from the client’s perspective. However, the application does not adequately validate or sanitize these parameters upon receiving them from the client. This lack of validation opens the door for an attacker to intercept the request, modify the seemingly read-only parameters (such as the username), and resubmit the altered request. The vulnerable backend then accepts these changes, effectively allowing the attacker to modify user account details without proper authorization.
CVSS Analysis
Currently, no CVSS score is available for CVE-2025-63523. However, based on the potential impact, a moderate severity rating can be expected. A successful exploit requires authentication, but the ability to modify usernames could have further ramifications depending on the application’s functionality and user roles.
Possible Impact
The exploitation of this vulnerability can have several potential impacts:
- Account Hijacking: An attacker can change the username of an existing account. This could be a first step in a more complex attack, potentially leading to complete account takeover if combined with other vulnerabilities.
- Data Corruption: Modified usernames can disrupt application functionality that relies on consistent user identifiers.
- Reputational Damage: If attackers exploit this vulnerability at scale, it can damage the reputation of systems using FeehiCMS.
Mitigation or Patch Steps
Until an official patch is released, the following mitigation steps are recommended:
- Input Validation: Implement strict server-side input validation to ensure that all parameters, including those presented as read-only, are properly validated before being processed.
- Parameter Hashing/Signing: Consider using techniques such as hashing or signing parameters to ensure their integrity during transit. The server can then verify the signature upon receiving the request.
- Regular Audits: Conduct regular security audits of your FeehiCMS installation to identify and address potential vulnerabilities.
- Stay Updated: Monitor the FeehiCMS project for updates and security advisories, and apply patches as soon as they are available.
