CVE-2026-103046: CWE-79 Improper neutralization of input during web page generation ('cross-site scripting') in The Wikimedia Foundation Mediawiki - WikiLambda Extension
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - WikiLambda extension allows Stored XSS. This issue affects MediaWiki - WikiLambda extension: before 1.46.1.
AI Analysis
Technical Summary
CVE-2026-103046 is a stored XSS vulnerability in the MediaWiki WikiLambda extension caused by improper input neutralization during web page generation. This flaw affects versions prior to 1.46.1 and allows attackers to inject malicious scripts that persist and execute in the context of users viewing the affected pages.
Potential Impact
Successful exploitation could allow attackers to execute arbitrary scripts in the context of users' browsers, potentially leading to session hijacking, defacement, or other malicious actions within the MediaWiki environment. However, no known exploits are reported in the wild at this time.
Mitigation Recommendations
A patch is available that fixes this vulnerability in MediaWiki WikiLambda extension version 1.46.1. Users and administrators should upgrade to version 1.46.1 or later to remediate this issue. Since this is a cloud-hosted service, the Wikimedia Foundation manages remediation for the hosted environment; users should verify that their instances are updated accordingly.
CVE-2026-103046: CWE-79 Improper neutralization of input during web page generation ('cross-site scripting') in The Wikimedia Foundation Mediawiki - WikiLambda Extension
Description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - WikiLambda extension allows Stored XSS. This issue affects MediaWiki - WikiLambda extension: before 1.46.1.
Affected software
The Wikimedia Foundation
Mediawiki - WikiLambda Extension
pkg:github/wikimedia/mediawiki-wikilambda-extensionRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-103046 is a stored XSS vulnerability in the MediaWiki WikiLambda extension caused by improper input neutralization during web page generation. This flaw affects versions prior to 1.46.1 and allows attackers to inject malicious scripts that persist and execute in the context of users viewing the affected pages.
Potential Impact
Successful exploitation could allow attackers to execute arbitrary scripts in the context of users' browsers, potentially leading to session hijacking, defacement, or other malicious actions within the MediaWiki environment. However, no known exploits are reported in the wild at this time.
Mitigation Recommendations
A patch is available that fixes this vulnerability in MediaWiki WikiLambda extension version 1.46.1. Users and administrators should upgrade to version 1.46.1 or later to remediate this issue. Since this is a cloud-hosted service, the Wikimedia Foundation manages remediation for the hosted environment; users should verify that their instances are updated accordingly.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- wikimedia-foundation
- Date Reserved
- 2026-09-29T22:29:32.001Z
- State
- PUBLISHED
- Is Cloud Service
- true
Threat ID: 6abc410c680226ef6865f89f
Added to database: 09/29/2026, 22:51:56 UTC
Last enriched: 09/29/2026, 23:06:18 UTC
Last updated: 09/29/2026, 23:49:02 UTC
Views: 5
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