CVE-2026-49368

HighUpdated

Published: 29 May 2026

Published

29 May 2026

Modified

17 June 2026

KEV Added

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Patch

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CVSS Score v3.1 8.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

EPSS Score 0.0020 9.9th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-49368 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Jetbrains Youtrack. Its CVSS base score is 8.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique JavaScript (T1059.007); ranked at the 9.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-33416

Vulnerability details

In JetBrains YouTrack before 2026.1.13162 stored XSS in project notification templates was possible

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1059.007 JavaScript Execution

Adversaries may abuse various implementations of JavaScript for execution.

attack.mitre.org →

T1189 Drive-by Compromise Initial Access

Adversaries may gain access to a system through a user visiting a website over the normal course of browsing.

attack.mitre.org →

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

Stored XSS (CWE-79) directly enables arbitrary JavaScript execution in victim browsers (T1059.007) and facilitates drive-by compromise or exploitation of the public-facing YouTrack application (T1189/T1190).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0