An issue was discovered in MediaWiki 1.34.x before 1.34.4.
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
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.
Why it matters now
EPSS 0.01104 65th percentileScored 2026-11-07
Fix Fixed mediawiki/core (Packagist): 1.34.3, 1.35.0
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) | 1.34.0 to before 1.34.3 | 1.34.3 | Patch available | GHSA-rj9p-8jxj-2ch4 |
| — | mediawiki/core (Packagist) | 1.35.0-rc.0 to before 1.35.0 | 1.35.0 | Patch available | GHSA-rj9p-8jxj-2ch4 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- mediawiki/core (Packagist) Vendor— Affected 1.34.0 to before 1.34.3 Fixed in 1.34.3 Patch available GHSA-rj9p-8jxj-2ch4
- mediawiki/core (Packagist) Vendor— Affected 1.35.0-rc.0 to before 1.35.0 Fixed in 1.35.0 Patch available GHSA-rj9p-8jxj-2ch4
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:* | 1.34.0 to before 1.34.4 | Vulnerable | mediawiki |
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | 33 | Vulnerable | Fedoraproject |
- cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:* Versions 1.34.0 to before 1.34.4 Vulnerable ·mediawiki
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
Remediation
- Fix · GHSA-rj9p-8jxj-2ch4 mediawiki/core (Packagist) Fixed in 1.34.3 Advisory →
- Fix · GHSA-rj9p-8jxj-2ch4 mediawiki/core (Packagist) Fixed in 1.35.0 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 2 products
- Red Hat OpenShift Container Platform 3.11
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2020-25812
- 2026-10-03 Alias added: GHSA-rj9p-8jxj-2ch4
References
Advisory 5
- https://gerrit.wikimedia.org/g/mediawiki/core/+/ad4a3ba45fb955aa8c0eb3c83809b16b40a498b9/includes/specials/SpecialContributions.php#592
- https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html
- https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html
- FEDORA-2020-a4802c53d9
- https://nvd.nist.gov/vuln/detail/CVE-2020-25812
Sources
- CVE-2020-25812 · CVE Program
- CVE-2020-25812 · NVD
- FIRST EPSS
- GHSA-rj9p-8jxj-2ch4 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-25812 · 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