What is the CVSS score of EUVD-2025-16906?

EUVD-2025-16906 has a CVSS 3.1 base score of 6.7 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L. EPSS exploitation probability: 0.1%.

Which versions of PHP are affected by EUVD-2025-16906?

Organizations using FreshRSS should be aware of notable risk from CVE-2025-31136, a cross-site scripting vulnerability rated CVSS 6.7.. A patch is available.

Is there a public PoC exploit available for EUVD-2025-16906?

Yes, a public proof-of-concept exploit is available for EUVD-2025-16906. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate EUVD-2025-16906?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

PHP EUVD-2025-16906

| CVE-2025-31136 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2025-06-04 security-advisories@github.com

PHP RCE XSS Debian Freshrss

6.7

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.7 MEDIUM

AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low

Lifecycle Timeline

EUVD ID Assigned

Mar 14, 2026 - 17:29 euvd

EUVD-2025-16906

Analysis Generated

Mar 14, 2026 - 17:29 vuln.today

Patch released

Mar 14, 2026 - 17:29 nvd

Patch available

PoC Detected

Jun 10, 2025 - 15:08 vuln.today

Public exploit code

CVE Published

Jun 04, 2025 - 20:15 nvd

MEDIUM 6.7

DescriptionGitHub Advisory

FreshRSS is a self-hosted RSS feed aggregator. Prior to version 1.26.2, it's possible to run arbitrary JavaScript on the feeds page. This occurs by combining a cross-site scripting (XSS) issue that occurs in f.php when SVG favicons are downloaded from an attacker-controlled feed containing <script> tags inside of them that aren't sanitized, with the lack of CSP in f.php by embedding the malicious favicon in an iframe (that has sandbox="allow-scripts allow-same-origin" set as its attribute). An attacker needs to control one of the feeds that the victim is subscribed to, and also must have an account on the FreshRSS instance. Other than that, the iframe payload can be embedded as one of two options. The first payload requires user interaction (the user clicking on the malicious feed entry) with default user configuration, and the second payload fires instantly right after the user adds the feed or logs into the account while the feed entry is still visible. This is because of lazy image loading functionality, which the second payload bypasses. An attacker can gain access to the victim's account by exploiting this vulnerability. If the victim is an admin it would be possible to delete all users (cause damage) or execute arbitrary code on the server by modifying the update URL using fetch() via the XSS. Version 1.26.2 has a patch for the issue.

Analysis

Technical ContextAI

Cross-site scripting (XSS) allows injection of client-side scripts into web pages viewed by other users due to insufficient output encoding.

RemediationAI

A vendor patch is available — apply it immediately. Encode all user-supplied output contextually (HTML, JS, URL). Implement Content Security Policy (CSP) headers. Use HTTPOnly and Secure cookie flags.