CVE-2026-14358 Stored XSS in Wikimedia Chart pie tooltip via Data:*.tab field title

Medium 6.9 Published 1 Jul 2026 Updated 10 Jul 2026

Attackers can inject malicious scripts into chart tooltips, 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: Not needed
Fix: Available

What is CVE-2026-14358?

CVE-2026-14358 is a medium-severity cross-site scripting vulnerability in Mediawiki Mediawiki, published on 1 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - Charts Extension allows Cross-Site Scripting (XSS).

This issue affects Mediawiki - Charts Extension: from * before 1.43.9,1.44.6,1.45.4.

Weakness: CWE-79

Which versions are affected by CVE-2026-14358?

It affects 1 product.

Products include Mediawiki Mediawiki.

How do I fix CVE-2026-14358?

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-2026-14358 being exploited?

There is no known exploitation of CVE-2026-14358 in the wild and no public exploit code.

All Mediawiki Mediawiki vulnerabilities

Sources

Also known as GHSA-f5m8-q8gq-mjpw, MINI-96xg-hx5h-g2w5, MINI-9vjw-45f4-4h9g, MINI-grp8-2q2p-vv64.