Vulnerability · Published Apr 9, 2021 · Assigned by mitre
CVE-2021-30156
Medium 4.3
In plain English
A medium-severity security flaw in the mediawiki package (Ubuntu). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 67% of all known vulnerabilities).
Severity (CVSS NVD)4.3Medium
Exploit odds (30 days)1.1%top 33.2% 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 1.31.12 and 1.32.x through 1.35.x before 1.35.2. Special:Contributions can leak that a "hidden" user exists.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:25.10 | mediawiki | no fix listed | UBUNTU-CVE-2021-30156 |
| Ubuntu:26.04:LTS | mediawiki | no fix listed | UBUNTU-CVE-2021-30156 |
| Ubuntu:26.10 | mediawiki | no fix listed | UBUNTU-CVE-2021-30156 |
Affected products (as reported)
References
- https://phabricator.wikimedia.org/T276306 x_refsource_MISC
- FEDORA-2021-f4223b6684 vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-d298103d3a vendor-advisory, x_refsource_FEDORA