In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes…
Priority LOW 26CWE-74Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.
Summary
In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).
Why it matters now
EPSS 0.01152 67th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial mediawiki/core (Packagist): 1.31.7, 1.33.3, 1.34.1Red Hat: 2 without a fix
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 |
| — | mediawiki/core (Packagist) | 1.31.0 to before 1.31.7 | 1.31.7 | Patch available | GHSA-pfm2-mqwj-ggm5 |
| — | mediawiki/core (Packagist) | 1.33.0 to before 1.33.3 | 1.33.3 | Patch available | GHSA-pfm2-mqwj-ggm5 |
| — | mediawiki/core (Packagist) | 1.34.0 to before 1.34.1 | 1.34.1 | Patch available | GHSA-pfm2-mqwj-ggm5 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- mediawiki/core (Packagist) Vendor— Affected 1.31.0 to before 1.31.7 Fixed in 1.31.7 Patch available GHSA-pfm2-mqwj-ggm5
- mediawiki/core (Packagist) Vendor— Affected 1.33.0 to before 1.33.3 Fixed in 1.33.3 Patch available GHSA-pfm2-mqwj-ggm5
- mediawiki/core (Packagist) Vendor— Affected 1.34.0 to before 1.34.1 Fixed in 1.34.1 Patch available GHSA-pfm2-mqwj-ggm5
Remediation
- Fix · GHSA-pfm2-mqwj-ggm5 mediawiki/core (Packagist) Fixed in 1.31.7 Advisory →
- Fix · GHSA-pfm2-mqwj-ggm5 mediawiki/core (Packagist) Fixed in 1.33.3 Advisory →
- Fix · GHSA-pfm2-mqwj-ggm5 mediawiki/core (Packagist) Fixed in 1.34.1 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift Container Platform 3.11 | Affected | No fix planned: Will not fix |
| Red Hat OpenShift Container Platform 4 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-10960
- 2026-10-03 Alias added: GHSA-pfm2-mqwj-ggm5
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-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-2020-10960 · CVE Program
- CVE-2020-10960 · NVD
- FIRST EPSS
- GHSA-pfm2-mqwj-ggm5 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-10960 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences