Quick answers
- Is CVE-2026-103493 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103493 being exploited in the wild.
- How severe is CVE-2026-103493?
- High severity, with a CVSS score of 8.1, published 1 October 2026.
- Which products and versions are affected?
- Jetbrains YouTrack before 2026.2.19422.
- Is there a fix for CVE-2026-103493?
- Yes: fixed in YouTrack 2026.2.19422. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-103493 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-103493?
- Check whether you run Jetbrains YouTrack at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: YouTrack 2026.2.19422
Technical details
This is a stored cross-site scripting (XSS) vulnerability in YouTrack's handling of Mermaid diagram syntax and LaTeX formula content. Malicious scripts embedded in these markup formats persist in the database and execute when other users view the affected issues or documents, allowing attackers to steal credentials or session tokens without requiring additional user interaction beyond viewing.
Affected products
- JetBrains YouTrack before 2026.2.19422
Timeline
- 2026-10-01: disclosed