CVE-2021-36126

PoC —

CVSS 3.1

9.8 critical

EPSS

1%p67

Published

Jul 2, 2021 (Jul 2, 2021)

Modified

Jun 17, 2026

Description

An issue was discovered in the AbuseFilter extension in MediaWiki through 1.36. If the MediaWiki:Abusefilter-blocker message is invalid within the content language, the filter user falls back to the English version, but that English version could also be invalid on a wiki. This would result in a fatal error, and potentially fail to block or restrict a potentially nefarious user.

Vendors: mediawiki
Products: mediawiki
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (1.2%)

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