High [CVE-2026-21584] Confluence: 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 high-severity Atlassian advisory covers CVE-2026-21584 affecting Bamboo Data Center.
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Summary
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
See the release notes ( ).
This vulnerability was reported via our Penetration Testing program.
- Bamboo Data Center 12.1.0 to 12.1.9
- Bamboo Data Center 12.0.0 to 12.0.2
- Bamboo Data Center 11.0.0 to 11.0.8
- Bamboo Data Center 10.2.0 to 10.2.21
- Bamboo Data Center 10.1.0 to 10.1.1
- Bamboo Data Center 10.0.0 to 10.0.3
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 10.2
- 10.2.22
- 12.1
- 12.1.10
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- 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).
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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