What is CVE-2021-31554?

CVE-2021-31554 is a medium-severity vulnerability in MediaWiki, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2021-04-22.

How severe is CVE-2021-31554?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in MediaWiki

CVE-2021-31554

An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. It improperly handled account blocks for certain automatically created MediaWiki user accounts, thus allowing nefarious users to remain unblocked.

Vulnerability class: Broken Access Control

EPSS: 0.005 (39.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Mediawiki
N/a — versions n/a

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)
cve@mitre.org (x_refsource_MISC, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2021-31554?: CVE-2021-31554 is a medium-severity vulnerability in MediaWiki, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2021-04-22.
How severe is CVE-2021-31554?: Medium severity. CVSS v3 base score is 5.4 out of 10.