CVE-2021-31549
MEDIUMCVSS 4.3/10EPSS 0.80%
Last modified
CVE-2021-31549 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. The Special:AbuseFilter/examine form allowed for the disclosure of suppressed MediaWiki usernames to unprivileged users.. EPSS estimates a 0.80% chance of exploitation in the next 30 days.
Description
An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. The Special:AbuseFilter/examine form allowed for the disclosure of suppressed MediaWiki usernames to unprivileged users.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mediawiki | Mediawiki | <= 1.35.2 |
References
- https://gerrit.wikimedia.org/r/q/I6063c02fa261c4cc0e6dbbb2db4e111eb85912c2Issue Tracking, Vendor Advisory
- https://gerrit.wikimedia.org/r/q/I71a6d521bd12931ce60eec4d2dc35af19146000fIssue Tracking, Vendor Advisory
- https://phabricator.wikimedia.org/T274152Third Party Advisory
- https://gerrit.wikimedia.org/r/q/I6063c02fa261c4cc0e6dbbb2db4e111eb85912c2Issue Tracking, Vendor Advisory
- https://gerrit.wikimedia.org/r/q/I71a6d521bd12931ce60eec4d2dc35af19146000fIssue Tracking, Vendor Advisory
- https://phabricator.wikimedia.org/T274152Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-31549?
An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. The Special:AbuseFilter/examine form allowed for the disclosure of suppressed MediaWiki usernames to unprivileged users.
How severe is CVE-2021-31549?
CVE-2021-31549 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.80% probability of exploitation in the next 30 days.
How do I fix CVE-2021-31549?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-31549?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST