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Wikimedia Foundation MediaWiki - WikiLambda ExtensionStored i18n XSS in WikiLambda's VisualEditor integration

Risk 33
XSS

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension allows Cross-Site Scripting (XSS).

This issue affects Mediawiki - WikiLambda Extension: 1.47.0-alpha. The issue has been remediated on the master branch.

First published (updated )
CVE-2026-100383

Wikimedia Foundation MediaWiki - WikiLambda ExtensionRevision-deleted pages can be viewed through WikiLambda's action=edit and Special:ViewAbstract

Risk 35
Infoleak

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension allows Excavation.

This issue affects Mediawiki - WikiLambda Extension: 1.47.0-alpha. The issue has been remediated on the master branch.

First published (updated )
CVE-2026-100377

Wikimedia Foundation MediaWiki - WikiLambda ExtensionWikiLambda public function execution bypasses the unsaved-code permission through nested Z825 compositions

Risk 13
Severity
2.9
EPSS
0.23%
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:X

Improper handling of insufficient permissions or privileges vulnerability in The Wikimedia Foundation Mediawiki - WikiLambda Extension on Linux, MacOS, and Windows allows Accessing Functionality Not Properly Constrained by ACLs.

This issue affects Mediawiki - WikiLambda Extension: before 1.47.0.

First published (updated )
CVE-2026-96872

Wikimedia Foundation MediaWiki - WikiLambda ExtensionBlocked users can create and edit WikiLambda objects

Risk 50
Severity
6.9
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Improper neutralization of input terminators vulnerability in The Wikimedia Foundation Mediawiki - WikiLambda Extension allows Authentication Bypass.

This issue affects Mediawiki - WikiLambda Extension: from before 1.43.9,1.44.6,1.45.4.

First published (updated )
CVE-2026-58517

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