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CVE-2026-21571

8.8 · HIGH

This Critical severity OS Command Injection vulnerability was introduced in 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 of Bamboo Data Center.

Published Apr 21, 2026CWE-78EPSS 1.34%

Overview

CVE-2026-21571 is a high-severity vulnerability. It was published on April 21, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

This Critical severity OS Command Injection vulnerability was introduced in 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 of Bamboo Data Center.

This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 9.4 and a CVSS Vector of

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H allows an authenticated attacker to execute commands

on the remote system, which has high impact to confidentiality, high impact to integrity, high impact to availability,

and requires no user interaction.

Atlassian recommends that Bamboo Data Center customers upgrade to latest version, if you are unable to do so, upgrade

your instance to one of the specified supported fixed versions:

Bamboo Data Center 9.6.0: Upgrade to a release greater than or equal to 9.6.25

Bamboo Data Center 10.2: Upgrade to a release greater than or equal to 10.2.18 

Bamboo Data Center 12.1: Upgrade to a release greater than or equal to 12.1.6

See the release notes

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refconfluence.atlassian.com/pages/viewpage.action?pageId=1770913890Refjira.atlassian.com/browse/BAM-26364

How CyberStrike helps

Frequently asked questions

What is CVE-2026-21571?

CVE-2026-21571 is a high-severity vulnerability. It was published on April 21, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-21571?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-21571?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-21571?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-21571 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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