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Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

AtlassianCVE-2026-21584

Atlassian Bamboo Data Center: improper authorization

Atlassian

CVE-2026-21584 · Published Aug 18, 2026 · updated Sep 2, 2026

High7.6
No fix yet
Atlassian advisory

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.

Affected versions

PackageAffectedFixed in
Bamboo Data Center
Product
<= 12.1.0 to 12.1.9No fix yet
<= 12.0.0 to 12.0.2No fix yet
<= 11.0.0 to 11.0.8No fix yet
<= 10.2.0 to 10.2.21No fix yet
Details and references
CVSS 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-285

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