In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol

cisa 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.

1. 2026-07-27 CISA SSVC: exploitation active
2. 2026-07-27 First public exploit (Metasploit exploit/multi/http/jetbrains_teamcity_rce_cve_2026_63077)
3. 2026-07-27 Published
4. 2026-08-05 Added to CISA KEV
5. 2026-08-08 CISA patch deadline

Added

3 mo ago (2026-08-05)

Patch by

2026-08-08 (3 mo ago)

Ransomware

Known to be used in ransomware campaigns

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.

Vendor, product

JetBrains, TeamCity

CISA name

JetBrains TeamCity Deserialization of Untrusted Data Vulnerability

Exploitation

Active, exploited in the wild

Automatable

yes

Technical impact

total

Assessed

3 mo ago (2026-07-27)

94.89% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

• Metasploit exploit/multi/http/jetbrains_teamcity_rce_cve_2026_63077 JetBrains TeamCity Agent Polling Unauthenticated Remote Code Execution metasploit exploit, excellent rank, 2026-07-27
• Nuclei template JetBrains TeamCity < 2026.1.3, 2025.11.7 - Remote Code Execution nuclei detection template

• JetBrains TeamCity

Weakness

• CWE-502 Deserialization of Untrusted Data

• jetbrains.com /privacy-security/issues-fixed/

  vendor-advisory

• cisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-63077

  government-resource, us-government-resource

• CVE List CVE-2026-63077
• NVD CVE-2026-63077

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.