CVE-2026-103493 Cross-site scripting in YouTrack
Attackers can execute arbitrary scripts in victim browsers via stored XSS in Mermaid and LaTeX content, potentially leading to account takeover.
- 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-2026-103493?
CVE-2026-103493 is a high-severity cross-site scripting vulnerability in Jetbrains Youtrack, published on 1 Oct 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
In JetBrains YouTrack before 2026.2.19422 stored XSS via Mermaid and LaTeX content was possible
Weakness: CWE-79
Which versions are affected by CVE-2026-103493?
It affects 1 product.
Products include Jetbrains Youtrack.
How do I fix CVE-2026-103493?
No fix has been published for CVE-2026-103493 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-2026-103493 being exploited?
There is no known exploitation of CVE-2026-103493 in the wild and no public exploit code.
Other vulnerabilities in Jetbrains Youtrack
Sources
Also known as GHSA-6qqm-669w-6778.