What is CVE-2026-63077?

CVE-2026-63077 is a critical-severity vulnerability in Jetbrains Teamcity, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-27.

How severe is CVE-2026-63077?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Jetbrains Teamcity

CVE-2026-63077

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

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Jetbrains Teamcity — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

cve@jetbrains.com

Frequently asked questions

What is CVE-2026-63077?: CVE-2026-63077 is a critical-severity vulnerability in Jetbrains Teamcity, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-27.
How severe is CVE-2026-63077?: Critical severity. CVSS v3 base score is 9.8 out of 10.