[ CVE-2026-103446 · Published 30 Sep 2026 ]

Vulnerability in The Wikimedia Foundation MediaWiki WikiLambda extension

CVSS 7.4 EPSS <1%1 agency advisoryNo fix listed yet

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

BSI CERT-Bund30 Sep 2026WID-SEC-2026-3693

MediaWiki Extensions: Multiple vulnerabilities Translated from German
CVE-2026-103446CVE-2026-103445CVE-2026-103444+9 more CVEs

[ References ]References

[ Facts ]Key facts

CVE: CVE-2026-103446
EUVD: EUVD-2026-90199
Published: 30 Sep 2026, 18:18 UTC
Updated: 6 Oct 2026, 19:17 UTC
NVD status: Awaiting Analysis
CVSS 4.0: 7.4 High
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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:N/AU:Y/R:U/V:C/RE:M/U:Amber
Scored by c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
EPSS: 0.33% chance of exploitation in 30 days · higher than 25% of CVEs
CISA SSVC: Exploitation: none · Automatable: no · Impact: total
Weakness: CWE-639

[ Affected ]Affected products

The Wikimedia Foundation MediaWiki WikiLambda extension1.46

[ Description ]Official description

[ Fixes ]Fixes and patches

[ Advisories ]Government CERT advisories

MediaWiki Extensions: Multiple vulnerabilities Translated from German

[ References ]References