CVE-2023-37303 json
An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3.
published 2023-06-30 3 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2023-37303 , EUVD-2023-41207
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.
Patch / fix
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 23 mo ago
Exploit prediction
0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- phabricator.wikimedia.org https://phabricator.wikimedia.org/T338276 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mediawiki | <1.39.4 |
1.39.4 |
Classification
- Weakness
-
- CWE-754 Improper Check for Unusual or Exceptional Conditions
References
-
phabricator.wikimedia.org
/T338276
exploit, issue-tracking, patch, vendor-advisory, web
-
gerrit.wikimedia.org
/r/q/I10a9273c542576b3f7bb38de68dcd2aa41cfb1b0
vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2023-37303
web
Sources
- CVE List CVE-2023-37303
- NVD CVE-2023-37303
- OSV BIT-mediawiki-2023-37303
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.