CVE-2026-34093: Special:UserRights allows viewing user rights from private wiki

Q: What is the severity of CVE-2026-34093?

CVE-2026-34093 is classified as a vulnerability allowing exposure of sensitive information to unauthorized actors.

Q: How do I fix CVE-2026-34093?

To fix CVE-2026-34093, update your MediaWiki installation to version 1.43.8, 1.44.5, or 1.45.3 or later.

Q: What versions of MediaWiki are affected by CVE-2026-34093?

CVE-2026-34093 affects MediaWiki versions up to and including 1.43.7, 1.44.4, and 1.45.2.

Q: What type of information is exposed in CVE-2026-34093?

CVE-2026-34093 exposes user rights information that should be kept private from unauthorized actors.

Q: Who is responsible for fixing CVE-2026-34093?

The responsibility for fixing CVE-2026-34093 lies with the administrators of affected MediaWiki installations.

Published May 11, 2026

Updated

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 Software

4 affected components

Wikimedia Foundation MediaWiki<1.43.7, <1.44.4, <1.45.2

MediaWiki MediaWiki<1.43.7

MediaWiki MediaWiki>=1.44.0<1.44.4

MediaWiki MediaWiki>=1.45.0<1.45.2

Event History

May 11, 2026

CVE Published

via MITRE·04:48 PM

Data Sourced

via MITRE·04:48 PM

DescriptionWeakness

Data Sourced

via NVD·06:16 PM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-34093?

CVE-2026-34093 is classified as a vulnerability allowing exposure of sensitive information to unauthorized actors.

How do I fix CVE-2026-34093?

To fix CVE-2026-34093, update your MediaWiki installation to version 1.43.8, 1.44.5, or 1.45.3 or later.

What versions of MediaWiki are affected by CVE-2026-34093?

CVE-2026-34093 affects MediaWiki versions up to and including 1.43.7, 1.44.4, and 1.45.2.

What type of information is exposed in CVE-2026-34093?

CVE-2026-34093 exposes user rights information that should be kept private from unauthorized actors.

Who is responsible for fixing CVE-2026-34093?

The responsibility for fixing CVE-2026-34093 lies with the administrators of affected MediaWiki installations.

Company

Resources

Contact

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