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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (39.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- phabricator.wikimedia.org/T272244 (Third Party Advisory)
- gerrit.wikimedia.org/r/q/Ie1f4333d5b1c9d17fb2236fe38a31de427a4cc48 (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.