TI-2026-17406 Aliases CVE-2026-21584 GHSA-6ghh-4pm9-h5h5

Improper authorization in Atlassian Bamboo Data Center

LOW 36CWE-285Published 2026-08-18 · Updated 2026-08-28

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-285.

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 * 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0046 40th percentileScored 2026-11-07

Fix Fixed Bamboo Data Center (Atlassian): 12.1.10, 10.2.22

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Atlassian	Bamboo Data Center	12.1.0 to 12.1.9; 12.0.0 to 12.0.2; 11.0.0 to 11.0.8; 10.2.0 to 10.2.21; 10.1.0 to 10.1.1; 10.0.0 to 10.0.3	12.1.10, 10.2.22	Patch available	CNA

Bamboo Data Center VendorAtlassian Affected 12.1.0 to 12.1.9; 12.0.0 to 12.0.2; 11.0.0 to 11.0.8; 10.2.0 to 10.2.21; 10.1.0 to 10.1.1; 10.0.0 to 10.0.3 Fixed in 12.1.10, 10.2.22 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:atlassian:bamboo::::::::	10.0.0 to before 10.2.22; 11.0.0 to before 12.1.10	Vulnerable	Atlassian

cpe:2.3:a:atlassian:bamboo:*:*:*:*:*:*:*:* Versions 10.0.0 to before 10.2.22; 11.0.0 to before 12.1.10 Vulnerable ·Atlassian

Remediation

Fix · CNA Bamboo Data Center (Atlassian) Fixed in 12.1.10, 10.2.22

Timeline

2026-10-02 Threatist record created from CVE-2026-21584
2026-10-03 Alias added: GHSA-6ghh-4pm9-h5h5

References

Advisory 2

TI-2026-67904 Arbitrary file access in Atlassian Data Center products KEVCVSS 4.0CRITICAL 9.3
TI-2012-02540 Atlassian JIRA before 5.0.1; Confluence before 3.5.16, 4.0 before 4.0.7, and 4.1 before… CVSS 3.1CRITICAL 9.1
TI-2022-09598 Improper authentication in Atlassian Bamboo Server CVSS 3.1CRITICAL 9.8
TI-2016-04529 Atlassian Bamboo before 5.11.4.1 and 5.12.x before 5.12.3.1 does not properly restrict… CVSS 3.0CRITICAL 9.8
TI-2015-06881 An unspecified resource in Atlassian Bamboo before 5.9.9 and 5.10.x before 5.10.0 allows… CVSS 3.0CRITICAL 9.8
TI-2014-07936 The Ignite Realtime Smack XMPP API, as used in Atlassian Bamboo before 5.9.9 and 5.10.x… CVSS 3.0CRITICAL 9.8

See all 27 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences