CVE-2025-11261: Stored i18n XSS exposed by security patch for T402077

Published Feb 3, 2026
·
Updated

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files resources/src/mediawiki.Language/mediawiki.Language.Js.

This issue affects MediaWiki: from before 1.39.15, 1.43.5, 1.44.2.

Affected Software

4 affected components
Wikimedia Foundation MediaWiki<1.39.15
MediaWiki MediaWiki<1.39.15
MediaWiki MediaWiki>=1.43.0<1.43.5
MediaWiki MediaWiki>=1.44.0<1.44.2

Event History

Feb 3, 2026
CVE Published
via MITRE·12:25 AM
Data Sourced
via MITRE·12:25 AM
DescriptionWeakness
Data Sourced
via NVD·01:15 AM
DescriptionSeverityWeaknessAffected Software
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of CVE-2025-11261?

CVE-2025-11261 has a moderate severity level due to its potential for stored XSS attacks in vulnerable MediaWiki installations.

2

How do I fix CVE-2025-11261?

To fix CVE-2025-11261, upgrade to MediaWiki version 1.39.15 or later as this version addresses the vulnerability.

3

What systems are affected by CVE-2025-11261?

CVE-2025-11261 affects Wikimedia Foundation MediaWiki versions prior to 1.39.15.

4

What type of vulnerability is CVE-2025-11261?

CVE-2025-11261 is a stored i18n XSS vulnerability that arises from improper neutralization of input during web page generation.

5

Is CVE-2025-11261 easily exploitable?

Yes, CVE-2025-11261 is considered easily exploitable if the affected version of MediaWiki is deployed without mitigation measures.

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203