CVE-2026-103442 MergeAccount PHP object injection via session-key substitution
Attackers can execute arbitrary code via PHP object injection in the MediaWiki CentralAuth extension by manipulating session keys.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-103442?
CVE-2026-103442 is a high-severity code injection vulnerability in The Wikimedia Foundation MediaWiki CentralAuth extension, published on 30 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
External control of system or configuration setting vulnerability in The Wikimedia Foundation MediaWiki CentralAuth extension allows Code Injection.
This issue affects MediaWiki CentralAuth extension: 1.46, 1.45, and 1.43.
Weakness: CWE-15
Which versions are affected by CVE-2026-103442?
How do I fix CVE-2026-103442?
No fix has been published for CVE-2026-103442 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-103442 being exploited?
There is no known exploitation of CVE-2026-103442 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-7c6r-9xcw-h46m.