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CVE-2025-54591: Information Exposure in FreshRSS affecting versions 1.26.3 and below

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Overview

This report discusses a significant vulnerability identified as CVE-2025-54591 that affects FreshRSS, a self-hostable RSS aggregator. This vulnerability exposes sensitive information about feeds and tags of default admin users, posing a potential threat to system compromise and data leakage. It primarily affects users running versions 1.26.3 and below of the software.

Vulnerability Summary

CVE ID: CVE-2025-54591
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage due to lack of access checking in the FreshRSS_Auth::hasAccess() function

Affected Products

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Product | Affected Versions

FreshRSS | 1.26.3 and below

How the Exploit Works

The vulnerability arises due to a lack of access checking in the FreshRSS_Auth::hasAccess() function used by some of the tag/feed related endpoints. FreshRSS controllers usually have a defined firstAction() method with an override to make sure that every action requires access. However, when this method is not defined, each action must manually check for access. The vulnerability is exploited when certain endpoints neither use the firstAction() method nor perform a manual access check, thereby exposing sensitive information.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. This hypothetical HTTP request targets an unprotected endpoint:

GET /feed/endpoint HTTP/1.1
Host: target.example.com

This request could potentially expose sensitive information about feeds and tags of default admin users due to the lack of access control checks.
Please note that this example is purely theoretical and is provided to assist in understanding the nature of the vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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