CVE-2026-58026 $wgNonincludableNamespaces can be bypassed by embedding redirect in other namespaces
Attackers can bypass namespace restrictions to expose sensitive information in MediaWiki installations using non-default configurations.
- 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-2026-58026?
CVE-2026-58026 is a vulnerability in Mediawiki Mediawiki, published on 1 Jul 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/Parser/Parser.Php.
This issue affects MediaWiki: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.
Weakness: CWE-200
Which versions are affected by CVE-2026-58026?
It affects 1 product.
Products include Mediawiki Mediawiki.
How do I fix CVE-2026-58026?
Upgrade to a fixed version.
Is CVE-2026-58026 being exploited?
There is no known exploitation of CVE-2026-58026 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as DEBIAN-CVE-2026-58026, GHSA-jp4p-rf6v-wv5p, MINI-4xw3-2mjg-rgqr, MINI-6rpf-pc27-9ph8, MINI-gqwv-9rfj-r275, UBUNTU-CVE-2026-58026.