CVE-2026-49371

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 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

EPSS Score 0.0025 16.5th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-49371 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Jetbrains Teamcity. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 16.5th 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-2026-33379

Vulnerability details

In JetBrains TeamCity before 2026.1.1 reflected XSS in the keyword filter was possible

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

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 →

T1185 Browser Session Hijacking Collection

Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.

attack.mitre.org →

Why these techniques?

Reflected XSS in public-facing TeamCity app directly enables exploitation of the application (T1190) and facilitates browser session hijacking via script execution (T1185).

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