Cross-site scripting (XSS) vulnerability in the CSS user subpage preview feature in…
Priority LOW 29CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-79.
Summary
Cross-site scripting (XSS) vulnerability in the CSS user subpage preview feature in MediaWiki before 1.23.15, 1.26.x before 1.26.4, and 1.27.x before 1.27.1 allows remote attackers to inject arbitrary web script or HTML via the edit box in Special:MyPage/common.css.
Why it matters now
EPSS 0.01016 63rd 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 · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:* | up to 1.23.14 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.26.0:*:*:*:*:*:*:* | 1.26.0 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.26.1:*:*:*:*:*:*:* | 1.26.1 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.26.2:*:*:*:*:*:*:* | 1.26.2 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.26.3:*:*:*:*:*:*:* | 1.26.3 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.26.4:*:*:*:*:*:*:* | 1.26.4 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.27.0:*:*:*:*:*:*:* | 1.27.0 | Vulnerable | mediawiki |
- cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:* Versions up to 1.23.14 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.26.0:*:*:*:*:*:*:* Versions 1.26.0 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.26.1:*:*:*:*:*:*:* Versions 1.26.1 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.26.2:*:*:*:*:*:*:* Versions 1.26.2 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.26.3:*:*:*:*:*:*:* Versions 1.26.3 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.26.4:*:*:*:*:*:*:* Versions 1.26.4 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.27.0:*:*:*:*:*:*:* Versions 1.27.0 Vulnerable ·mediawiki
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2016-6333
- 2026-10-03 Alias added: GHSA-hxwm-9f7g-wg4h
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-2016-6333 · CVE Program
- CVE-2016-6333 · NVD
- FIRST EPSS
- GHSA-hxwm-9f7g-wg4h · GitHub Advisory Database · CC BY 4.0
- CVE-2016-6333 · 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