Vulnerability · Published Dec 18, 2020 · Assigned by mitre
CVE-2020-35475
High 7.5
In plain English
A high-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 1.6% (higher than 76% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.6%top 24.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.)
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mediawiki | 1:1.35.1-1 | DEBIAN-CVE-2020-35475 |
| Debian:13 | mediawiki | 1:1.35.1-1 | DEBIAN-CVE-2020-35475 |
| Debian:14 | mediawiki | 1:1.35.1-1 | DEBIAN-CVE-2020-35475 |
| Ubuntu:25.10 | mediawiki | no fix listed | UBUNTU-CVE-2020-35475 |
| Ubuntu:26.04:LTS | mediawiki | no fix listed | UBUNTU-CVE-2020-35475 |
| Ubuntu:26.10 | mediawiki | no fix listed | UBUNTU-CVE-2020-35475 |
Affected products (as reported)
References
- https://phabricator.wikimedia.org/T268917 x_refsource_MISC
- https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html x_refsource_MISC
- DSA-4816 vendor-advisory, x_refsource_DEBIAN
- FEDORA-2020-0be2d40e13 vendor-advisory, x_refsource_FEDORA