# CVE-2026-111094: JetBrains TeamCity remote code execution in build messages protocol

Source: https://junglewise.ai/threats/cve-2026-111094-in-jetbrains-teamcity-before-2026-2-2026-1-4-2025-11-8-remote  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-15. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-111094 · Severity: high · CVSS 8.1 · Published 2026-10-15

JetBrains TeamCity is a continuous integration and build automation server used by development teams. A whitelist bypass vulnerability in the build messages protocol allows unauthenticated remote code execution on affected servers, potentially giving attackers complete control of the system and access to source code and build artifacts.

Technologies: [Jetbrains TeamCity](https://junglewise.ai/threats/technologies/teamcity). Vendors: [Jetbrains](https://junglewise.ai/threats/vendors/jetbrains).

## Quick answers

**Is CVE-2026-111094 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111094 being exploited in the wild.

**How severe is CVE-2026-111094?** High severity, with a CVSS score of 8.1, published 15 October 2026.

**Which products and versions are affected?** Jetbrains TeamCity before 2026.2, 2026.1.4, 2025.11.8.

**Is there a fix for CVE-2026-111094?** Yes: fixed in TeamCity 2026.2, 2026.1.4, 2025.11.8. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-111094 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-111094?** Check whether you run Jetbrains TeamCity at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in TeamCity 2026.2, 2026.1.4, 2025.11.8

## Technical details

The vulnerability is a whitelist bypass in TeamCity's build messages protocol that allows remote code execution without authentication. The flaw affects the message parsing logic and can be exploited over the network by sending malicious build messages.

## Affected products

- JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8

## Timeline

- 2026-10-15: disclosed

## References

- [https://www.jetbrains.com/privacy-security/issues-fixed/](https://www.jetbrains.com/privacy-security/issues-fixed/)

## Related threats

- [JetBrains TeamCity stored XSS in classic build log](https://junglewise.ai/threats/cve-2026-111096-in-jetbrains-teamcity-before-2026-2-2026-1-4-2025-11-8-stored)
- [JetBrains TeamCity stored XSS in project overview](https://junglewise.ai/threats/cve-2026-111095-in-jetbrains-teamcity-before-2026-2-2026-1-4-2025-11-8-stored)
- [JetBrains TeamCity Git submodule URL validation bypass](https://junglewise.ai/threats/cve-2026-106219-in-jetbrains-teamcity-before-2026-2-1-missing-validation-of-git)
- [JetBrains TeamCity Kotlin DSL sandbox escape RCE](https://junglewise.ai/threats/cve-2026-106218-in-jetbrains-teamcity-before-2026-1-3-2025-11-7-kotlin-dsl)
- [JetBrains TeamCity administrator account takeover via password reset](https://junglewise.ai/threats/cve-2026-100255-in-jetbrains-teamcity-before-2026-2-2026-1-4-2025-11-8)