CVE-2026-63077: JetBrains TeamCity

What is CVE-2026-63077?

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

CVSS9.8 NVD 3.1

SeverityCRITICAL

Exploitation In the wild In CISA KEV

EPSS11% · P95

Triage statusActive Exploit

ActionPatch immediately

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD published2026-07-27

NVD last modified2026-08-06

Timeline

2026-07-27Published to the U.S. National Vulnerability Database (NVD)
2026-08-05Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-08-06NVD record last updated
2026-08-07First covered in a defend.network daily briefing
2026-08-08CISA federal remediation deadline (BOD 22-01)

CISA Known Exploited Vulnerability

JetBrains TeamCity Deserialization of Untrusted Data Vulnerability

Added to KEV2026-08-05

Federal patch deadline2026-08-08

Known ransomware useUnknown

Affected product

JetBrains TeamCity

Remediation Steps

Check CISA's Known Exploited Vulnerabilities catalog for confirmation that this CVE affects your systems
Apply the vendor patch immediately
Monitor systems for evidence of exploitation
Review access logs for suspicious activity on affected assets

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 2 of August 2026 (August 10 – 16)
Vulnerability Priority Report – Week 1 of August 2026 (August 3 – 9)
Vulnerability Priority Report – Week 4 of July 2026 (July 27 – August 2)
npm malware cluster, Metabase zero-day exploited, UNC6671 rebrands (2026-08-08)
Linux KVM escape, Cisco SD-WAN patches, Spectre v2 defenses bypassed (2026-08-07)

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.