CVE-2026-103050 Stored i18n XSS in MassMessage
Attackers can inject malicious scripts into MassMessage pages, potentially stealing user sessions or executing code in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-103050?
CVE-2026-103050 is a medium-severity cross-site scripting vulnerability in The Wikimedia Foundation Mediawiki - MassMessage extension, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - MassMessage extension allows Stored XSS.
This issue affects Mediawiki - MassMessage extension: before 1.46.1, 1.45.5, 1.43.10.
Weakness: CWE-79
Which versions are affected by CVE-2026-103050?
How do I fix CVE-2026-103050?
No fix has been published for CVE-2026-103050 yet. Limit exposure of the affected software until one is available.
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-2026-103050 being exploited?
There is no known exploitation of CVE-2026-103050 in the wild and no public exploit code.
Sources
Also known as GHSA-9j6w-3g83-7xg8, UBUNTU-CVE-2026-103050.