CVE-2026-21584 PUBLISHED

Assigner: atlassian
Reserved: 01.01.2026 Published: 18.08.2026 Updated: 18.08.2026

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.

<pre>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. </pre>

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 7.6

Product Status

Vendor Atlassian
Product Bamboo Data Center
Versions
  • Version 12.1.0 to 12.1.9 is affected
  • Version 12.0.0 to 12.0.2 is affected
  • Version 11.0.0 to 11.0.8 is affected
  • Version 10.2.0 to 10.2.21 is affected
  • Version 10.1.0 to 10.1.1 is affected
  • Version 10.0.0 to 10.0.3 is affected
  • Version 12.1.10 is unaffected
  • Version 10.2.22 is unaffected

References

Problem Types

  • Improper Authorization Improper Authorization