Vulnerability · Published May 11, 2026 · Assigned by wikimedia-foundation
CVE-2026-34093Special:UserRights allows viewing user rights from private wiki
Low 1.1
In plain English
A low-severity information exposure in MediaWiki from Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Specials/SpecialUserRights.Php. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mediawiki | 1:1.39.17-1+deb12u2 | DEBIAN-CVE-2026-34093 |
| Debian:13 | mediawiki | 1:1.43.8+dfsg-1~deb13u1 | DEBIAN-CVE-2026-34093 |
| Debian:14 | mediawiki | 1:1.43.8+dfsg-1 | DEBIAN-CVE-2026-34093 |
| Ubuntu:25.10 | mediawiki | no fix listed | UBUNTU-CVE-2026-34093 |
| Ubuntu:26.04:LTS | mediawiki | no fix listed | UBUNTU-CVE-2026-34093 |
| Ubuntu:26.10 | mediawiki | no fix listed | UBUNTU-CVE-2026-34093 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wikimedia Foundation | MediaWiki | * – before 1.43.7, 1.44.4, 1.45.2 |
Weakness: CWE-200 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/R:A