CVE-2026-103446

WikiLambda exposes anonymous execution of unsaved Abstract Wikipedia fragments

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.

Affected

The Wikimedia Foundation · MediaWiki WikiLambda extension

CVSS v4.0 CNA

7.4 HIGHCVSS: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

EPSS

0.33% chance of exploitation in the next 30 days, 24th percentile

Published

2026-09-30

Updated

2026-10-06

Proof-of-concept exploits (1)

• BomboBombone/CVE-2026-1034460★ · 2026-09-30

References

• CVE Record
• NVD entry

Related

• CVE-2026-103437
• CVE-2026-103440
• CVE-2026-103441
• CVE-2026-103442
• CVE-2026-103445
• CVE-2026-103584