XSS in MediaWiki
CVE-2020-35474
In MediaWiki before 1.35.1, the combination of Html::rawElement and Message::text leads to XSS because the definition of MediaWiki:recentchanges-legend-watchlistexpiry can be changed onwiki so that the output is 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 (63.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.011 · change: +0.000
Affected products
- MediaWiki
- Fedoraproject Fedora — versions 33
Weakness classification (CWE)
References
- phabricator.wikimedia.org/T268894 (Exploit, Third Party Advisory)
- lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html (Mailing List, Release Notes, Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-35474?
- CVE-2020-35474 is a medium-severity vulnerability in MediaWiki, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-12-18.
- How severe is CVE-2020-35474?
- Medium severity. CVSS v3 base score is 6.1 out of 10.