How to fix CVE-2025-53491?

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

Is Wikimedia Foundation Mediawiki affected by CVE-2025-53491?

CVE-2025-53491 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 5.4. Attackers could inject scripts to steal sessions or perform actions as authenticated users. Organizations should apply vendor updates when available and monitor for exploitation.

Wikimedia Foundation Mediawiki CVE-2025-53491

EUVD-2025-20268 MEDIUM

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

2025-07-07 c4f26cc8-17ff-4c99-b5e2-38fc1793eacc

XSS

5.4

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch available

Apr 16, 2026 - 05:29 EUVD

1.43.2

Analysis Generated

Mar 16, 2026 - 03:37 vuln.today

EUVD ID Assigned

Mar 16, 2026 - 03:37 euvd

EUVD-2025-20268

CVE Published

Jul 07, 2025 - 17:15 nvd

MEDIUM 5.4

DescriptionNVD

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - FlaggedRevs Extension allows Cross-Site Scripting (XSS).This issue affects Mediawiki - FlaggedRevs Extension: from 1.43.X before 1.43.2.

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

Encode all user-supplied output contextually (HTML, JS, URL). Implement Content Security Policy (CSP) headers. Use HTTPOnly and Secure cookie flags.

CVE-2025-53491 vulnerability details – vuln.today

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