CVE-2021-31554 json
An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2.
published 5y ago modified 4mo ago also BIT-mediawiki-2021-31554 , EUVD-2021-18451
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 42%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami mediawiki 1.35.3
Is CVE-2021-31554 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| NVD | 2.0 | 5.5 | AV:N/AC:L/Au:S/C:P/I:P/A:N |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mediawiki | <1.35.3 |
1.35.3 |
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
gerrit.wikimedia.org
/r/q/Ie1f4333d5b1c9d17fb2236fe38a31de427a4cc48
issue-tracking, vendor-advisory, web
-
phabricator.wikimedia.org
/T272244
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-31554
web
Sources
- CVE List CVE-2021-31554
- NVD CVE-2021-31554
- OSV BIT-mediawiki-2021-31554
Fencer Intel 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.