CVE-2021-31549 json
An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2.
published 2021-04-22 5 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2021-31549 , EUVD-2021-18446
- cvss
- 4.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami mediawiki 1.35.3
Exploit prediction
0.80% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
| OSV | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mediawiki | <1.35.3 |
1.35.3 |
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
gerrit.wikimedia.org
/r/q/I6063c02fa261c4cc0e6dbbb2db4e111eb85912c2
issue-tracking, vendor-advisory, web
-
gerrit.wikimedia.org
/r/q/I71a6d521bd12931ce60eec4d2dc35af19146000f
issue-tracking, vendor-advisory, web
-
phabricator.wikimedia.org
/T274152
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-31549
web
Sources
- CVE List CVE-2021-31549
- NVD CVE-2021-31549
- OSV BIT-mediawiki-2021-31549
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