CVE-2026-21584 Atlassian — Exploit & Vulnerability Details HIGH

Parameter	Value
CVSS	7.6 (HIGH)
Affected Versions	10.0.0 — 12.1.10
Fixed In	10.2.22
Type	CWE-285 (Improper Authorization)
Vendor	Atlassian
Public PoC	No

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.

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

Low

Easy to exploit

Attack Requirements

Present

Additional conditions required

Privileges Required

Low

Basic privileges needed

User Interaction

None

No user interaction needed

Impact Assessment

Confidentiality

High

Complete data leak

Integrity

High

Complete data modification

Availability

None

No disruption

CVSS Vector v4.0

Weakness Type (CWE)

CWE-285 Improper Authorization

Vulnerable Products 2

Configuration	From (including)	Up to (excluding)
Atlassian Bamboo cpe:2.3:a:atlassian:bamboo::::::::	`10.0.0`	`10.2.22`
Atlassian Bamboo cpe:2.3:a:atlassian:bamboo::::::::	`11.0.0`	`12.1.10`