Critical RCE Alert: Bamboo Data Center Vulnerable to OS Command Injection

Atlassian has issued a high-priority advisory for its Bamboo Data Center users, detailing a critical-severity security flaw that could allow attackers to take full control of affected servers. The vulnerability, tracked as CVE-2026-21571, has been assigned a CVSS score of 9.4, signaling a severe threat to CI/CD infrastructure.

This Remote Code Execution (RCE) flaw enables an authenticated attacker to bypass security boundaries and execute arbitrary operating system commands directly on the remote system.

The vulnerability is categorized as an OS Command Injection. Because Bamboo manages sensitive build processes, credentials, and deployment pipelines, a successful exploit has devastating consequences:

• Total Compromise: Attackers can achieve high impact across the “CIA triad”—Confidentiality, Integrity, and Availability.
• No User Interaction: The exploit requires no action from a legitimate user to succeed.
• Low Attack Threshold: While the attacker must be authenticated, the attack complexity is low, making it a highly reliable primitive for malicious actors.

The flaw was introduced across several major release branches of the Bamboo Data Center. If you are running any of the following versions, your environment is at risk:

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

Atlassian strongly recommends that all customers upgrade to the latest available version of Bamboo Data Center to close this security gap. For organizations requiring specific long-term support branches, the following fixed versions have been designated:

Given the critical nature of CI/CD servers in the modern software supply chain, administrators should treat this update as an emergency. Securing the build environment is essential to prevent attackers from injecting malicious code into production software or stealing sensitive environment secrets.

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