XSS in MediaWiki
CVE-2020-35479
MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. Language::translateBlockExpiry itself does not escape in all code paths. For example, the return of Language::userTimeAndDate is is always unsafe for HTML in a month value. This affects MediaWiki 1.12.0 and later.
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: 0.015 (73.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: +0.000
Affected products
- MediaWiki
- Debian Linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 33
Weakness classification (CWE)
Public proof-of-concept exploits
References
- phabricator.wikimedia.org/T268938 (Exploit, Vendor Advisory)
- 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.debian.org/debian-lts-announce/2020/12/msg00034.html (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-35479?
- CVE-2020-35479 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-2020-35479?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2020-35479 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.