High-Severity RCE Flaw in Atlassian Bamboo Threatens CI/CD Environments

Atlassian has sounded the alarm for users of its Bamboo Data Center, uncovering a high-severity Remote Code Execution (RCE) vulnerability that could allow attackers to seize control of development environments. The flaw, identified as CVE-2026-21570, carries a CVSS score of 8.6, highlighting a significant risk to the continuous integration and deployment (CI/CD) pipelines of major enterprises.

As a cornerstone of many software development lifecycles, a compromise within Bamboo could lead to the injection of malicious code into downstream software products, making this patch a top priority for IT security teams.

The vulnerability allows an attacker who has already gained authenticated access to the system to escalate their impact by executing arbitrary code. While the requirement for authentication (PR:H) provides a slight barrier, the potential for a “High” impact on the system’s confidentiality, integrity, and availability makes it a critical concern.

“This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 8.6, allows an authenticated attacker to execute malicious code on the remote system”.

The breach effectively bypasses standard security boundaries, allowing a malicious actor to interact directly with the remote system’s underlying architecture.

The vulnerability is notably widespread, affecting multiple major release cycles of the Data Center product. According to the advisory, the flaw was introduced in the following versions:

• 9.6.0
• 10.0.0, 10.1.0, 10.2.0
• 11.0.0, 11.1.0
• 12.0.0 and 12.1.0

Atlassian strongly recommends that all Bamboo Data Center customers migrate to the latest available version immediately. For organizations restricted to specific release branches, the following minimum fixed versions have been designated:

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Written by

@DdoS · Security Researcher

Do Son

Do Son is the Founder and Editor of SecurityOnline.info. Working in cybersecurity since 2013, he reports on vulnerabilities, malware, and emerging threats, providing timely analysis to help organizations and individuals stay ahead of evolving risks.