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9.8
CVE-2026-111094: JetBrains TeamCity could let attackers run code remotely
CVE-2026-111094 · published 1 day ago
Summary
Versions of JetBrains TeamCity released before the 2026.2 update allow a flaw in the way build messages are processed. An attacker who can send specially crafted messages could bypass safety checks and execute commands on the server. Update TeamCity to the latest version as soon as possible to close the gap.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| jetbrains | teamcity |
< 2026.2,
2026.1.4,
2025.11.8 < 2025.11.8 >= 2026.1, < 2026.1.4 |
Original advisory text
In JetBrains TeamCity before 2026.2,
2026.1.4,
2025.11.8 remote code execution via a whitelist bypass in the build messages protocol was possible
In JetBrains TeamCity before 2026.2,
2026.1.4,
2025.11.8 remote code execution via a whitelist bypass in the build messages protocol was possible
2026.1.4,
2025.11.8 remote code execution via a whitelist bypass in the build messages protocol was possible
References
- https://www.jetbrains.com/privacy-security/issues-fixed/ Vendor Advisory
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker full control
Severity
9.8
Critical
Type
CWE-502Deserialization of Untrusted Data
Timeline
Published15 Oct 2026
Updated16 Oct 2026
First seen15 Oct 2026
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