CVE-2026-34092 Block UI elements in 'tools'-sidebar shows presence of an autoblocked IP
An attacker can determine if an IP address is autoblocked by observing UI elements in the tools sidebar, leaking sensitive blocking status information.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-34092?
CVE-2026-34092 is a low-severity vulnerability in Mediawiki Mediawiki, published on 11 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki.
This vulnerability is associated with program files includes/Skin/Skin.Php.
This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.
Weakness: CWE-200
Which versions are affected by CVE-2026-34092?
It affects 1 product.
Products include Mediawiki Mediawiki.
How do I fix CVE-2026-34092?
Upgrade to a fixed version.
Is CVE-2026-34092 being exploited?
There is no known exploitation of CVE-2026-34092 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as DEBIAN-CVE-2026-34092, GHSA-rg4j-v2c4-8gfh, UBUNTU-CVE-2026-34092.