Vulnerability · Published Dec 18, 2020 · Assigned by mitre
CVE-2020-35480
Medium 5.3
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)5.3Medium
Exploit odds (30 days)1.5%top 25.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An issue was discovered in MediaWiki before 1.35.1. Missing users (accounts that don't exist) and hidden users (accounts that have been explicitly hidden due to being abusive, or similar) that the viewer cannot see are handled differently, exposing sensitive information about the hidden status to unprivileged viewers. This exists on various code paths.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mediawiki | 1:1.35.1-1 | DEBIAN-CVE-2020-35480 |
| Debian:13 | mediawiki | 1:1.35.1-1 | DEBIAN-CVE-2020-35480 |
| Debian:14 | mediawiki | 1:1.35.1-1 | DEBIAN-CVE-2020-35480 |
| Ubuntu:25.10 | mediawiki | no fix listed | UBUNTU-CVE-2020-35480 |
| Ubuntu:26.04:LTS | mediawiki | no fix listed | UBUNTU-CVE-2020-35480 |
| Ubuntu:26.10 | mediawiki | no fix listed | UBUNTU-CVE-2020-35480 |
Affected products (as reported)
References
- https://phabricator.wikimedia.org/T120883 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