Information disclosure in MediaWiki
CVE-2021-31547
An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. Its AbuseFilterCheckMatch API reveals suppressed edits and usernames to unprivileged users through the iteration of crafted AbuseFilter rules.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (57.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
Weakness classification (CWE)
References
- phabricator.wikimedia.org/T223654 (Third Party Advisory)
- gerrit.wikimedia.org/r/q/I3f7dbd8b873d411e37c8c3aac2339bf5ec36907d (Third Party Advisory, Issue Tracking)
- gerrit.wikimedia.org/r/q/I4900b1be73323599d74e3164447f81eded094d75 (Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2021-31547?
- CVE-2021-31547 is a medium-severity vulnerability in MediaWiki, classified under Information Disclosure. CVSS score: 4.3/10. Published 2021-04-22.
- How severe is CVE-2021-31547?
- Medium severity. CVSS v3 base score is 4.3 out of 10.