Assessment
Why it matters
EPSS is 0.3%; technical severity is CVSS 8.2.
In JetBrains TeamCity before 2026.1.1 reflected XSS in the keyword filter was possible
Who should care
- Teams operating TeamCity
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether TeamCity is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Vendor advisory from www.jetbrains.com
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
- CWE
- CWE-79
- Affected versions
- JetBrains TeamCity (End Excluding 2026.1.1)
- Fixed versions
- JetBrains TeamCity (Fixed from 2026.1.1)
- Published
- 29 May 2026
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
Signal timeline
- CVE published
- Latest EPSS score: 0.3%
- Signal calculated at 12