XSS in MediaWiki
CVE-2020-35475
In MediaWiki before 1.35.1, the messages userrights-expiry-current and userrights-expiry-none can contain raw HTML. XSS can happen when a user visits Special:UserRights but does not have rights to change all userrights, and the table on the left side has unchangeable groups in it. (The right column with the changeable groups is not affected and is escaped correctly.)
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.016 (74.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: +0.000
Affected products
- MediaWiki
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 33
Weakness classification (CWE)
References
- phabricator.wikimedia.org/T268917 (Third Party Advisory, Issue Tracking)
- lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html (Mailing List, Release Notes, Vendor Advisory)
- www.debian.org/security/2020/dsa-4816 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-35475?
- CVE-2020-35475 is a high-severity vulnerability in MediaWiki, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2020-12-18.
- How severe is CVE-2020-35475?
- High severity. CVSS v3 base score is 7.5 out of 10.