Cross-Site Scripting (XSS) in JetBrains YouTrack (CVE-2026-103493)
Summary
Cross-site scripting in JetBrains YouTrack (CVE-2026-103493). Confidential information can be exposed externally.
Original description
The description as published by the source.
In JetBrains YouTrack before 2026.2.19422 stored XSS via Mermaid and LaTeX content was possible
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A weakness called CVE-2026-103493 was discovered in JetBrains YouTrack.
In plain terms, it is a flaw that lets attackers sneak nasty scripts into a webpage.
Severity is High (CVSS 8.1/10). If exploited, attackers can leak data or disrupt key functionality.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "JetBrains YouTrack CVE-2026-103493".
CVE-2026-103493 (JetBrains YouTrack). Severity: High / CVSSv3 8.1. Category: CWE-79.
Response plan:
- Check the vendor advisory for affected versions and the patched release.
- If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
- If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
- Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
PoCs and fix commits: see the 'References' section, MITRE, and NVD.
A weakness (CVE-2026-103493) in JetBrains YouTrack. In plain words, it is a flaw that lets attackers sneak nasty scripts into a webpage.
Target versions of JetBrains YouTrack (see vendor advisory). If running in production, identify exposure immediately.
Severity: High (CVSS 8.1/10). If exploited, attackers can leak data or disrupt key functionality.
Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-79)
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.
References
- patch cve@jetbrains.com
- web nvd.nist.gov
- web jetbrains.com
- web github.com