On 2026-08-05, CISA added CVE-2026-63077 (JetBrains TeamCity) to its Known Exploited Vulnerabilities (KEV) catalog [2]. The vulnerability is listed in the catalog as "JetBrains TeamCity Deserialization of Untrusted Data Vulnerability" [2]. CISA requires remediation in accordance with the listed vendor mitigation guidance; see the original text in the body for specific requirements [2].
Backfill: this event became public on Aug 5, 2026 and we added it on Nov 10, 2026. It is not a new event.
CISA Adds JetBrains TeamCity Vulnerability CVE-2026-63077 to Known Exploited Vulnerabilities Catalog
1 min read
- Disclosed
- Aug 5, 2026
- Published
- Nov 10, 2026
- Last updated
- Nov 8, 2026
- CVSS basis
- Our assessment
- 94.9%, higher than 100% of CVEs
- Exploitation and patch status
- ExploitedKEV
- Attack vector
- Vulnerability status
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Government, Cross-industry
What to do nowOur advice
CISA requires remediation in accordance with the listed vendor mitigation guidance; see the original text in the body for specific requirements [2].
Timeline
Technical details
CISA KEV Listing Record
CISA added CVE-2026-63077 (JetBrains TeamCity) to the Known Exploited Vulnerabilities () catalog on 2026-08-05 [2].
Original Technical Description
JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated via the agent polling protocol. [2]
Official Required Action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. [2]
Individual Vulnerability Record
The U.S. National Vulnerability Database (NVD) provides an independent vulnerability record and description for CVE-2026-63077 [1].
References
Official / primary3
- [1]
“In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol”
- [2]CISA2026-08-05Accessed 2026-11-07
This site aggregates public information and is not security consulting advice. Test remediation steps before applying.