XSS in MediaWiki
CVE-2020-25812
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- MediaWiki
- Fedoraproject Fedora — versions 33
Weakness classification (CWE)
References
- gerrit.wikimedia.org/g/mediawiki/core/+/ad4a3ba45fb955aa8c0eb3c83809b16b40a498b… (Vendor Advisory)
- lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html (Mailing List, Vendor Advisory)
- lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html (Mailing List, Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-25812?
- CVE-2020-25812 is a medium-severity vulnerability in MediaWiki, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-09-27.
- How severe is CVE-2020-25812?
- Medium severity. CVSS v3 base score is 6.1 out of 10.