The wikitext parser in MediaWiki 1.17.x before 1.17.3 and 1.18.x before 1.18.2 allows…
Priority LOW 27Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
The wikitext parser in MediaWiki 1.17.x before 1.17.3 and 1.18.x before 1.18.2 allows remote attackers to cause a denial of service (infinite loop) via certain input, as demonstrated by the padleft function.
Why it matters now
EPSS 0.01876 79th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 11
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mediawiki:mediawiki:1.17:*:*:*:*:*:*:* | 1.17 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.17:beta_1:*:*:*:*:*:* | 1.17 beta_1 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.17.0:*:*:*:*:*:*:* | 1.17.0 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.17.0:rc1:*:*:*:*:*:* | 1.17.0 rc1 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.17.1:*:*:*:*:*:*:* | 1.17.1 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.17.2:*:*:*:*:*:*:* | 1.17.2 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.18:*:*:*:*:*:*:* | 1.18 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.18:beta_1:*:*:*:*:*:* | 1.18 beta_1 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.18.0:*:*:*:*:*:*:* | 1.18.0 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.18.0:rc1:*:*:*:*:*:* | 1.18.0 rc1 | Vulnerable | mediawiki |
- cpe:2.3:a:mediawiki:mediawiki:1.17:*:*:*:*:*:*:* Versions 1.17 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.17:beta_1:*:*:*:*:*:* Versions 1.17 beta_1 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.17.0:*:*:*:*:*:*:* Versions 1.17.0 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.17.0:rc1:*:*:*:*:*:* Versions 1.17.0 rc1 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.17.1:*:*:*:*:*:*:* Versions 1.17.1 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.17.2:*:*:*:*:*:*:* Versions 1.17.2 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.18:*:*:*:*:*:*:* Versions 1.18 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.18:beta_1:*:*:*:*:*:* Versions 1.18 beta_1 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.18.0:*:*:*:*:*:*:* Versions 1.18.0 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.18.0:rc1:*:*:*:*:*:* Versions 1.18.0 rc1 Vulnerable ·mediawiki
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2012-4885
- 2026-10-03 Alias added: GHSA-cw9f-6pvh-rr9x
References
Advisory 3
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-2023-03312 Stored XSS leads to privilege escalation in MediaWiki v1.40.0 CVSS 3.1CRITICAL 9.0
- TI-2026-42109 Cross-site request forgery in Wikimedia Foundation Mediawiki - RedirectManager Extension CVSS 4.0MEDIUM 6.9
- TI-2024-22822 An issue was discovered in includes/CommentFormatter/CommentParser.php in MediaWiki… CVSS 3.1HIGH 7.4
- TI-2023-18935 An issue was discovered in the ProofreadPage (aka Proofread Page) extension for MediaWiki… CVSS 3.1MEDIUM 5.3
Sources
- CVE-2012-4885 · CVE Program
- CVE-2012-4885 · NVD
- FIRST EPSS
- GHSA-cw9f-6pvh-rr9x · GitHub Advisory Database · CC BY 4.0
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