An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3.
Priority MEDIUM 48CWE-669Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special:CheckUserLog shows usernames that have been hidden.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0024 15th percentileScored 2026-11-07
Fix Fixed CheckUser (MediaWiki): 1.35.11, 1.38.7, 1.39.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| mediawiki | CheckUser | before 1.35.11; 1.36.0 to before 1.38.7; 1.39.0 to before 1.39.4 | 1.35.11, 1.38.7, 1.39.4 | Patch available | CNA |
- CheckUser Vendormediawiki Affected before 1.35.11; 1.36.0 to before 1.38.7; 1.39.0 to before 1.39.4 Fixed in 1.35.11, 1.38.7, 1.39.4 Patch available CNA
Remediation
- Fix · CNA CheckUser (MediaWiki) Fixed in 1.35.11, 1.38.7, 1.39.4
Timeline
- 2026-10-02 Threatist record created from CVE-2023-37252
- 2026-10-03 Alias added: GHSA-v83r-4pqq-r3wj
References
More mediawiki vulnerabilities
- TI-2023-18933 An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. CVSS 3.1CRITICAL 9.8
- TI-2023-13576 An issue was discovered in MediaWiki before 1.35.10, 1.36.x through 1.38.x before 1.38.6… CVSS 3.1CRITICAL 9.8
- TI-2020-17515 The Score extension through 0.3.0 for MediaWiki has a remote code execution vulnerability… CVSS 3.1CRITICAL 9.8
- TI-2024-32110 Backticks can allow the usage of not-allowed SQL functions CVSS 4.0HIGH 8.8
- TI-2023-03312 Stored XSS leads to privilege escalation in MediaWiki v1.40.0 CVSS 3.1CRITICAL 9.0
- TI-2026-42112 SQLi in Cargo extension via year range filter CVSS 4.0MEDIUM 6.9
Sources
- CVE-2023-37252 · CVE Program
- CVE-2023-37252 · NVD
- FIRST EPSS
- GHSA-v83r-4pqq-r3wj · GitHub Advisory Database · CC BY 4.0
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