Low severity · published Sep 23, 2026
CVE-2026-96872
WikiLambda public function execution bypasses the unsaved-code permission through nested Z825 compositions
2.9
CVSS
0.3%
EPSS
No
On KEV
Description
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MW
Mediawiki - WikiLambda Extension · The Wikimedia Foundation
before 1.47.0 · source: vendor
Affected product
MW
Mediawiki - WikiLambda Extension
The Wikimedia Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-96872
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-96872
gerrit.wikimedia.org
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikiLambda/+/1326392
phabricator.wikimedia.org
https://phabricator.wikimedia.org/T435085
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WikiLambda exposes anonymous execution of unsaved Abstract Wikipedia fragments
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4.3
CVE-2026-58517
Blocked users can create and edit WikiLambda objects