MSRXCVE-2026-63077
CVE-2026-63077
JetBrains TeamCity Deserialization of Untrusted Data Vulnerability
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.
CVSS 3.1 · CNA · jetbrains.com
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol
Scores
Affected products
- jetbrains teamcity: < 2025.11.7; ≥ 2026.1, < 2026.1.3
Weakness: CWE-502
2 references (advisories, patches, write-ups)
- https://www.jetbrains.com/privacy-security/issues-fixed/ · Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-63077 · US Government Resource
Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.