CVE-2026-100255
Analyzed Analyzed - Analysis Complete

JetBrains TeamCity Admin Account Takeover via Password Reset

Publication date: 2026-09-30

Last updated on: 2026-10-02

Assigner: JetBrains s.r.o.

Description
In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 administrator account takeover was possible via password reset

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Meta Information

Published
2026-09-30
Last Modified
2026-10-02
Generated
2026-10-19
AI Q&A
2026-09-30
EPSS Evaluated
2026-10-18
NVD
CVE-2026-100255
EUVD
EUVD-2026-89999

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
jetbrains teamcity to 2025.11.8 (exc)
jetbrains teamcity From 2026.1 (inc) to 2026.1.4 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-1289 The product receives an input value that is used as a resource identifier or other type of reference, but it does not validate or incorrectly validates that the input is equivalent to a potentially-unsafe value.

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Executive Summary

This vulnerability allows an attacker to take over a TeamCity administrator account by exploiting a password reset flaw in JetBrains TeamCity versions before 2026.2, 2026.1.4, and 2025.11.8.

Detection Guidance

This vulnerability involves JetBrains TeamCity before specific versions where administrator account takeover was possible via password reset. Detection requires checking the installed TeamCity version against the patched versions (2026.2, 2026.1.4, 2025.11.8). Use commands like 'curl -s http://<teamcity-server>/app/rest/server | grep version' to check the version.

Impact Analysis

An attacker could gain full control of the TeamCity server, leading to unauthorized access to sensitive project data, build pipelines, and potentially other connected systems.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA requirements for data protection and access control.

Mitigation Strategies

Update JetBrains TeamCity to version 2026.2, 2026.1.4, or 2025.11.8 or later to address the administrator account takeover vulnerability.

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