High severity · published Sep 30, 2026
CVE-2026-103446
WikiLambda exposes anonymous execution of unsaved Abstract Wikipedia fragments
7.4
CVSS
0.3%
EPSS
No
On KEV
Description
Authorization bypass through User-Controlled key vulnerability in The Wikimedia Foundation MediaWiki WikiLambda extension allows Authentication Bypass.
This issue affects MediaWiki WikiLambda extension: 1.46.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% 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
1.46 · source: vendor
Affected product
MW
MediaWiki WikiLambda extension
The Wikimedia Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103446
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103446
phabricator.wikimedia.org
https://phabricator.wikimedia.org/T435086
gerrit.wikimedia.org
https://gerrit.wikimedia.org/r/q/If2c05b109672fc65f63372f86c768859dc6639fd
More from MediaWiki WikiLambda extension
6.9
CVE-2025-62695
Stored XSS through system messages
6.1
CVE-2026-103046
WikifunctionsFragmentRenderer does unsafe string replacements on user-provided HTML
4.3
CVE-2026-58517
Blocked users can create and edit WikiLambda objects
2.9
CVE-2026-96872
WikiLambda public function execution bypasses the unsaved-code permission through nested Z825 compositions