CVE-2026-100275 Cross-site scripting in YouTrack

Medium 6.9 Published 30 Sep 2026 Updated 30 Sep 2026

Stored XSS in YouTrack workflow error notifications allows attackers to execute scripts in victim browsers, potentially leading to account takeover.

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-2026-100275?

CVE-2026-100275 is a medium-severity cross-site scripting vulnerability in Jetbrains Youtrack, 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

In JetBrains YouTrack before 2026.2.19197 stored XSS in the workflow error notification toast was possible

Weakness: CWE-79

Which versions are affected by CVE-2026-100275?

It affects 1 product.

Products include Jetbrains Youtrack.

How do I fix CVE-2026-100275?

No fix has been published for CVE-2026-100275 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-2026-100275 being exploited?

There is no known exploitation of CVE-2026-100275 in the wild and no public exploit code.

All Jetbrains Youtrack vulnerabilities

Sources

Also known as GHSA-fw7c-qpvf-j7qx.