CVE-2021-31548 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-2021-31548 , EUVD-2021-18445
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. A MediaWiki user who is partially blocked or was unsuccessfully blocked could bypass AbuseFilter and have their edits completed.
Patch / fix
- bitnami mediawiki 1.35.3
Exploit prediction
0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:P/A:N |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mediawiki | <1.35.3 |
1.35.3 |
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
phabricator.wikimedia.org
/T272333
third-party-advisory, web
-
gerrit.wikimedia.org
/r/q/Ifac795125927d584a31d95e1b4c4241eef860fa1
issue-tracking, third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-31548
web
Sources
- CVE List CVE-2021-31548
- NVD CVE-2021-31548
- OSV BIT-mediawiki-2021-31548
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.