Atlassian Bamboo Data Center up to 10.2.21/12.1.9 improper authorization

Summaryinfo

A vulnerability categorized as critical has been discovered in Atlassian Bamboo Data Center up to 10.2.21/12.1.9. This affects an unknown function. Executing a manipulation can lead to improper authorization. This vulnerability is tracked as CVE-2026-21584. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Atlassian Bamboo Data Center up to 10.2.21/12.1.9. It has been declared as critical. This vulnerability affects an unknown functionality. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

This High severity Improper Authorization vulnerability was introduced in versions 10.0.0, 10.1.0, 10.2.0, 11.0.0, 12.0.0, and 12.1.0 of Bamboo Data Center. This Improper Authorization vulnerability, with a CVSS Score of 7.6, allows an authenticated attacker to gain unintended access and can lead to the exposure of resources or functionality, possibly providing attackers with sensitive information or even execute arbitrary code. 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 10.2: Upgrade to a release greater than or equal to 10.2.22 * Bamboo Data Center 12.1: Upgrade to a release greater than or equal to 12.1.10 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). This vulnerability was reported via our Penetration Testing program.

The advisory is shared for download at confluence.atlassian.com. This vulnerability was named CVE-2026-21584 since 01/01/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 10.2.22 or 12.1.10 eliminates this vulnerability.

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Productinfo

Vendor

• Atlassian

Name

• Bamboo Data Center

Version

• 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
• 10.2.18
• 10.2.19
• 10.2.20
• 10.2.21
• 12.1.0
• 12.1.1
• 12.1.2
• 12.1.3
• 12.1.4
• 12.1.5
• 12.1.6
• 12.1.7
• 12.1.8
• 12.1.9

License

• free

Website

• Vendor: https://www.atlassian.com/

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