Atlassian Bamboo Data Center up to 9.6.24/10.2.17/12.1.5 Release Note os command injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in Atlassian Bamboo Data Center up to 9.6.24/10.2.17/12.1.5. This issue affects some unknown processing of the component Release Note Handler. Performing a manipulation results in os command injection. This vulnerability is reported as CVE-2026-21571. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Atlassian Bamboo Data Center up to 9.6.24/10.2.17/12.1.5. This affects an unknown functionality of the component Release Note Handler. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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 ([https://confluence.atlassian.com/bambooreleases/bamboo-release-notes-1189793869.html]). You can download the latest version of Bamboo Data Center from the download center ([https://www.atlassian.com/software/bamboo/download-archives]).

It is possible to read the advisory at confluence.atlassian.com. This vulnerability is uniquely identified as CVE-2026-21571 since 01/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

Upgrading to version 9.6.25, 10.2.18 or 12.1.6 eliminates this vulnerability.

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Productinfo

Vendor

• Atlassian

Name

• Bamboo Data Center

Version

• 9.6.0
• 9.6.1
• 9.6.2
• 9.6.3
• 9.6.4
• 9.6.5
• 9.6.6
• 9.6.7
• 9.6.8
• 9.6.9
• 9.6.10
• 9.6.11
• 9.6.12
• 9.6.13
• 9.6.14
• 9.6.15
• 9.6.16
• 9.6.17
• 9.6.18
• 9.6.19
• 9.6.20
• 9.6.21
• 9.6.22
• 9.6.23
• 9.6.24
• 10.2.0
• 10.2.1
• 10.2.2
• 10.2.3
• 10.2.4
• 10.2.5
• 10.2.6
• 10.2.7
• 10.2.8
• 10.2.9
• 10.2.10
• 10.2.11
• 10.2.12
• 10.2.13
• 10.2.14
• 10.2.15
• 10.2.16
• 10.2.17
• 12.1.0
• 12.1.1
• 12.1.2
• 12.1.3
• 12.1.4
• 12.1.5

License

• free

Website

• Vendor: https://www.atlassian.com/

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