CVE-2026-63077 Details.
JetBrains TeamCity < 2026.1.3, 2025.11.7 - Remote Code Execution
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-63077. What It Means.
JetBrains TeamCity < 2026.1.3, 2025.11.7 contains a remote code execution caused by unsafe XStream deserialization in the unauthenticated agent polling protocol. The XStream instance serving /app/agents/v1 is created without NoTypePermission.NONE, so XStream's default type permissions (Throwable, Map and Collection hierarchies) remain in effect next to the TeamCity allowlist. An unauthenticated attacker registers an agent, obtains a TeamCity-AgentSessionId, and posts an XStr…
Affected Product. What Is Hit.
- Vendor
- jetbrains
- Product
- JetBrains TeamCity
References. Where To Read More.
- https://blog.jetbrains.com/teamcity/2026/07/cve-2026-63077/
- https://www.rapid7.com/blog/post/ra-unauthenticated-rce-in-jetbrains-teamcity-cve-2026-63077/
- https://github.com/sfewer-r7/CVE-2026-63077
- https://nvd.nist.gov/vuln/detail/CVE-2026-63077
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-63077
FAQ
Common Questions.
JetBrains TeamCity < 2026.1.3, 2025.11.7 - Remote Code Execution. JetBrains TeamCity < 2026.1.3, 2025.11.7 contains a remote code execution caused by unsafe XStream deserialization in the unauthenticated agent polling protocol. The XStream instance serving /app/agents/v1 is created without NoTypePermission.NONE, so XStream's default type permissions (Throwable, Map and Collection hierarchies) remain in effect next to the TeamCity allowlist. An unauthenticated attacker registers an agent, obtains a TeamCity-AgentSessionId, and posts an XStr…
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-63077 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
Yes. CVE-2026-63077 is on the CISA Known Exploited Vulnerabilities list, which means attackers have used it against real targets.
Update JetBrains TeamCity to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-63077. Atlas does not run a check for it, so nothing here says whether a particular site is affected.