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CVE-2026-21589 is a critical path traversal vulnerability affecting multiple Atlassian Data Center products, including Bamboo Data Center. It allows an unauthenticated attacker to read or write arbitrary files within the web application root directory if the exact file name and path are known. The vulnerability does not permit directory listing or file enumeration. Several Atlassian products have fixed versions addressing this issue.

This vulnerability impacts Atlassian Data Center products such as Bitbucket, Confluence, Crowd, Jira Software, Jira Service Management, Bamboo, Crucible, and Fisheye. It enables unauthenticated remote attackers to perform arbitrary file read/write operations via path traversal within the web application root directory, contingent on prior knowledge of the target file's exact name and path. The flaw does not allow attackers to enumerate directory contents. Fixed versions are available for all affected products, with Bamboo Data Center fixed in versions 10.2.24 and later.

CVE-2026-21589 is a critical path traversal vulnerability affecting multiple Atlassian Data Center products, including Bamboo Data Center. It allows an unauthenticated attacker to read or write arbitrary files within the web application root directory if the exact file name and path are known. The v

CVE-2026-21589: Path Traversal (Arbitrary Read/Write) in Atlassian Bamboo Data Center

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