CVE-2026-84675 in TICS Plugin
Summary
by MITRE • 09/02/2026
OS command injection vulnerability in Jenkins TICS Plugin 2025.1.1 and earlier allows attackers able to control build environment variable values to execute arbitrary commands on the agent running the build.
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Analysis
by VulDB Data Team • 09/02/2026
The identified security flaw represents a critical OS command injection vulnerability within the Jenkins TICS Plugin, specifically affecting versions up through 2025.1.1. This vulnerability stems from an insufficient validation of user-supplied input when processing environment variable values that are passed to build processes. In typical CI/CD workflows, plugins often construct shell commands or system calls by concatenating configuration parameters with static strings. When the TICS Plugin fails to properly sanitize these inputs, it allows attackers who possess control over specific build environment variables to inject malicious operating system commands into the execution context of the Jenkins agent. This class of vulnerability is fundamentally rooted in CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as OS Command Injection. The severity lies not just in the injection itself but in the privilege level at which these commands are executed, typically under the user account associated with the Jenkins master or agent service, which often possesses broad system access to facilitate software builds and deployments.
The operational impact of this vulnerability is severe, potentially leading to complete compromise of the CI/CD infrastructure. An attacker who can manipulate build environment variables may execute arbitrary code on the underlying host machine running the Jenkins agent. This capability enables a range of malicious activities including data exfiltration, installation of persistent backdoors, lateral movement within the internal network, and disruption of critical software delivery pipelines. Since Jenkins agents often have access to source code repositories, deployment targets, and sensitive credentials stored in environment variables or credential stores, successful exploitation can result in significant intellectual property theft and operational downtime. The attack vector aligns with ATT&CK technique T1059 Command and Scripting Interpreter, specifically shell command execution, as the attacker leverages the system's native capabilities to perform unauthorized actions. Furthermore, if the Jenkins instance is configured to allow unauthenticated users or low-privilege developers to trigger builds with custom environment variables, the attack surface expands significantly, allowing remote code execution without prior authentication in some configurations.
Mitigation strategies must address both immediate remediation and long-term architectural security improvements. The primary defense is to upgrade the TICS Plugin to a version later than 2025.1.1 where this vulnerability has been patched by implementing proper input validation and output encoding mechanisms. Developers should ensure that all external inputs are strictly validated against an allowlist of expected characters before being incorporated into system commands. Additionally, Jenkins administrators should enforce principle of least privilege by configuring agents to run under restricted user accounts with minimal permissions, thereby limiting the blast radius in case of exploitation. Implementing robust input sanitization libraries and avoiding direct string concatenation for command construction are essential coding practices. Network segmentation can also help isolate build agents from sensitive production environments, reducing the potential impact of a compromised agent. Regular security audits and penetration testing focused on CI/CD pipelines are recommended to identify similar injection points in other plugins or custom scripts that interact with system shells.