CVE-2026-103446 The Wikimedia Foundation MediaWiki WikiLambda - Authentication Bypass

The Wikimedia Foundation MediaWiki WikiLambda extension 1.46 contains an authentication bypass caused by user-controlled key vulnerability, letting attackers bypass authentication, exploit requires crafted user input.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Required
EPSS
0.33% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
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
Published
30 September 2026
Updated
15 October 2026
Weakness
CWE-639

Vendor fix

Update to the latest version of MediaWiki WikiLambda extension.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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