— Unscored

JetBrains TeamCity Deserialization of Untrusted Data Vulnerability

CVE-2026-63077 Exploited

JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol.

Being exploited in the wild

Catalogued 5 August 2026 · US federal remediation deadline 8 August 2026 · Known use in ransomware campaigns

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…

Exploit code is also public: Metasploit · Public PoC · Nuclei template

Metasploitexploit/multi/http/jetbrains_teamcity_rce_cve_2026_63077
NucleiJetBrains TeamCity < 2026.1.3, 2025.11.7 - Remote Code Execution
Public PoCsfewer-r7/CVE-2026-6307720 stars
Public PoCunveiledhistory49/teamcity-cve-2026-63077-remediation
Public PoCBoredHackerBlog/teamcity-CVE-2026-63077-pcap
Public PoCAnggaTechI/CVE-2026-63077
Public PoCbakos-sandor-nx/teamcity-cve-2026-63077-remediation
Public PoC0xCyp1337/CVE-2026-63077
Public PoCbasesixtythree/B63-POC-CVE-2026-63077

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Yes — listed in the CISA KEV catalog
Exploit availability: CISA KEV, Metasploit, Public PoC, Nuclei template
Published: 5 August 2026
Last updated: 5 August 2026
Affected: JetBrains · TeamCity
Weakness: CWE-502

At the source

CISA KEV

References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

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Query this programmatically

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curl https://cve.zerocrew.in/api/cve/CVE-2026-63077