CVE-2026-111096 JetBrains CVE debrief

Who should care

Defenders responsible for JetBrains TeamCity deployments, especially those using classic build logs, should assess exposure and prioritize verification and potential updates.

Why it matters

CVE-2026-111096 is a stored XSS vulnerability in JetBrains TeamCity classic build logs. Defenders should verify exposure, prioritize updates or mitigations, and monitor for suspicious activity.

• Defenders need to verify exposure in their TeamCity deployments
• Potential for XSS attacks through classic build logs
• Need for updates or mitigations to prevent exploitation
• Verification of defensive controls and monitoring

Technical summary

CVE-2026-111096 is a stored XSS vulnerability in the classic build log of JetBrains TeamCity before versions 2026.2, 2026.1.4, and 2025.11.8. The vulnerability has a CVSS score of 6.7 and is classified as MEDIUM severity. This vulnerability could allow attackers to inject malicious scripts into the build log, potentially leading to unauthorized actions within the TeamCity environment. Defenders should prioritize verifying exposure in their TeamCity deployments, especially those using classic build logs, and assess the need for updates or mitigations.

Defensive priority

Defenders should prioritize verifying exposure in their TeamCity deployments, especially those using classic build logs, and assess the need for updates or mitigations.

Recommended defensive actions

• Verify TeamCity deployment versions and exposure to classic build log feature
• Assess the need for updates to versions 2026.2, 2026.1.4, or 2025.11.8
• Monitor classic build logs for suspicious activity
• Consider implementing compensating controls for XSS vulnerabilities

Evidence notes

The CVE record and source item provide details on the vulnerability, but specific exploitation or impact data is not available. The vulnerability has a CVSS score of 6.7 and is classified as MEDIUM severity. There is no information on known or unknown affected scope. Defenders should verify exposure in their TeamCity deployments, especially those using classic build logs, and assess the need for updates or mitigations.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.