Atlassian Bamboo Data Center path traversal

Summaryinfo

A vulnerability has been found in Atlassian Bamboo Data Center, Bamboo Server, Bitbucket Data Center, Bitbucket Server, Confluence Data Center, Confluence Server, Crowd Data Center, Crowd Server, Crucible Data Center, Crucible Server, Fisheye Data Center, Fisheye Server, Jira Service Management Data Center, Jira Service Management Server, Jira Software Data Center and Jira Software Server and classified as problematic. This impacts an unknown function. Performing a manipulation results in path traversal. This vulnerability is cataloged as CVE-2026-21589. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in Atlassian Bamboo Data Center, Bamboo Server, Bitbucket Data Center, Bitbucket Server, Confluence Data Center, Confluence Server, Crowd Data Center, Crowd Server, Crucible Data Center, Crucible Server, Fisheye Data Center, Fisheye Server, Jira Service Management Data Center, Jira Service Management Server, Jira Software Data Center and Jira Software Server. This affects an unknown part. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. The summary by CVE is:

h3. Summary This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center. Crowd Data Center, Crucible and Fisheye. This Arbitrary File Access vulnerability allows an unauthenticated attacker to access specific files within the web application root directory in affected versions. Exploitation requires prior knowledge of the target file's exact name and path; this vulnerability does not allow attackers to enumerate or list directory contents. In some configurations, there may be some sensitive files that make this highly severe.   h3. Context This vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions. h3. Details: * The vulnerability must be addressed for affected versions of: Bitbucket Data Center, introduced in version >= 4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1 Confluence Data Center, introduced in version >= 5.10.0, fix versions 9.2.26, 10.2.19 Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3, 7.1.1, 7.2.4 Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26, 11.3.12 Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40, 10.3.26, 11.3.12 Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12 Crucible, fix versions 4.9.15 Fisheye, fix version 4.9.15 * Exploitation requires prior knowledge of the target file's exact name and path. * The vulnerability does not include the capability to enumerate or list directory contents.

The advisory is shared at jira.atlassian.com. This vulnerability is uniquely identified as CVE-2026-21589 since 01/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/05/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Programming Tool Software

Vendor

• Atlassian

Name

• Bamboo Data Center
• Bamboo Server
• Bitbucket Data Center
• Bitbucket Server
• Confluence Data Center
• Confluence Server
• Crowd Data Center
• Crowd Server
• Crucible Data Center
• Crucible Server
• Fisheye Data Center
• Fisheye Server
• Jira Service Management Data Center
• Jira Service Management Server
• Jira Software Data Center
• Jira Software Server

License

• free

Website

• Vendor: https://www.atlassian.com/

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