CVE-2026-100254

Analyzed Analyzed - Analysis Complete

Authenticated Command Execution in JetBrains TeamCity via CRLF Injection

Publication date: 2026-09-30

Last updated on: 2026-10-06

Assigner: JetBrains s.r.o.

Description

In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 authenticated users could execute commands on Windows servers via CRLF injection in Pipeline Git connection settings

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-30

Last Modified

2026-10-06

Generated

2026-10-19

AI Q&A

2026-09-30

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100254

EUVD

EUVD-2026-89998

Affected Vendors & Products

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

KEV

CWE ID	Description
CWE-78	The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

This vulnerability in JetBrains TeamCity before versions 2026.2, 2026.1.4, and 2025.11.8 allows authenticated users to execute arbitrary commands on Windows servers. The attack occurs via CRLF injection in the Pipeline Git connection settings, enabling command execution through crafted input.

Detection Guidance

To detect this vulnerability, check TeamCity versions for affected releases (before 2026.2, 2026.1.4, 2025.11.8). Inspect Pipeline Git connection settings for CRLF injection attempts in user inputs. Monitor Windows servers for unauthorized command execution patterns.

Impact Analysis

An attacker with valid credentials could exploit this to run malicious commands on the server, potentially leading to data theft, system compromise, or unauthorized access to sensitive information. The high CVSS score indicates significant risk.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations may face fines or penalties for failing to secure systems adequately.

Mitigation Strategies

Update JetBrains TeamCity to version 2026.2, 2026.1.4, or 2025.11.8 or later to address the CRLF injection vulnerability in Pipeline Git connection settings.

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