Vulnerability · Published Dec 18, 2020 · Assigned by mitre
CVE-2020-35479
Medium 6.1
In plain English
A medium-severity security flaw in the mediawiki package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.1Medium
Exploit odds (30 days)1.5%top 25.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mediawiki | 1:1.35.1-1 | DEBIAN-CVE-2020-35479 |
| Debian:13 | mediawiki | 1:1.35.1-1 | DEBIAN-CVE-2020-35479 |
| Debian:14 | mediawiki | 1:1.35.1-1 | DEBIAN-CVE-2020-35479 |
| Ubuntu:25.10 | mediawiki | no fix listed | UBUNTU-CVE-2020-35479 |
| Ubuntu:26.04:LTS | mediawiki | no fix listed | UBUNTU-CVE-2020-35479 |
| Ubuntu:26.10 | mediawiki | no fix listed | UBUNTU-CVE-2020-35479 |
Affected products (as reported)
References
- https://phabricator.wikimedia.org/T268938 x_refsource_MISC
- https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html x_refsource_MISC
- DSA-4816 vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20201223 [SECURITY] [DLA 2504-1] mediawiki security update mailing-list, x_refsource_MLIST
- FEDORA-2020-0be2d40e13 vendor-advisory, x_refsource_FEDORA