CVE-2026-58028 Pretty-printed API output combined with centralauthtoken allows XSS with certain gadgets
Attackers can execute arbitrary scripts via XSS in MediaWiki API output when using CentralAuth, potentially compromising user accounts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58028?
CVE-2026-58028 is a cross-site scripting vulnerability in Mediawiki Mediawiki, published on 1 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki, Wikimedia Foundation CentralAuth.
This vulnerability is associated with program files includes/Api/ApiFormatBase.Php, includes/Api/ApiHelp.Php, includes/ResourceLoader/Module.Php, includes/Hooks/Handlers/PageDisplayHookHandler.Php, includes/LogFormatter/PermissionChangeLogFormatter.Php.
This issue affects MediaWiki: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9; CentralAuth: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.
Weakness: CWE-79
Which versions are affected by CVE-2026-58028?
It affects 1 product.
Products include Mediawiki Mediawiki.
How do I fix CVE-2026-58028?
Upgrade to a fixed version.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-58028 being exploited?
There is no known exploitation of CVE-2026-58028 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as DEBIAN-CVE-2026-58028, GHSA-jqc3-4vrw-8965, MINI-cg49-8px4-hv37, MINI-pc67-px3c-xcmc, MINI-rc7q-5vv5-jmv6, UBUNTU-CVE-2026-58028.