# CVE-2026-21584: This High severity Improper Authorization vulnerability was introduced in versions 10.0.0, 10.1.0, 10.2.0, 11.0.0…

Source: https://junglewise.ai/threats/cve-2026-21584-this-high-severity-improper-authorization-vulnerability-was  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-18  
License: CC BY 4.0 with a link back

CVE-2026-21584 · Severity: high · CVSS 8.1 · Published 2026-08-18

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.

Vendors: [Atlassian](https://junglewise.ai/threats/vendors/atlassian).

## Quick answers

**Is CVE-2026-21584 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21584 being exploited in the wild.

**How severe is CVE-2026-21584?** High severity, with a CVSS score of 8.1, published 18 August 2026.

**Which products and versions are affected?** Atlassian Bamboo. The advisory does not name versions.

**Is there a fix for CVE-2026-21584?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-21584?** Check whether you run Atlassian Bamboo. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Atlassian Bamboo

## Related threats

- [This Critical severity OS Command Injection vulnerability was introduced in versions 9.6.0, 10.0.0, 10.1.0, 10.2.0…](https://junglewise.ai/threats/cve-2026-21571-this-critical-severity-os-command-injection-vulnerability-was)