What is CVE-2021-36126?

CVE-2021-36126 is a critical-severity vulnerability in Mediawiki. CVSS score: 9.8/10. Published 2021-07-02.

How severe is CVE-2021-36126?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Mediawiki

CVE-2021-36126

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.

EPSS: 0.012 (65.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mediawiki
N/a — versions n/a

References

cve@mitre.org (Exploit, Patch, x_refsource_MISC, Issue Tracking, Vendor Advisory)
cve@mitre.org (Patch, x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-36126?: CVE-2021-36126 is a critical-severity vulnerability in Mediawiki. CVSS score: 9.8/10. Published 2021-07-02.
How severe is CVE-2021-36126?: Critical severity. CVSS v3 base score is 9.8 out of 10.