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CVE-2026-63077: JetBrains TeamCity Deserialization of Untrusted Data Vulnerability

criticalknown exploitedpublic exploitCVE-2026-63077
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol.

CSIRTS triage

vendor: JetBrainsproduct: TeamCityUnsafe deserializationRemote code execution
What
Deserialization of untrusted data vulnerability in the agent polling protocol allows unauthenticated remote code execution.
Who is affected
JetBrains TeamCity deployments with agent polling protocol exposed to unauthenticated connections.
Urgency
Critical — actively exploited with full system compromise post-exploitation and no authentication required.
Action
Update JetBrains TeamCity to patched version addressing CVE-2026-63077 immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-08-05
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-63077

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-63077coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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