Unauthenticated Arbitrary File Access in Atlassian Data Center (v4.6.0+)
CVE-2026-21589 Published on October 5, 2026
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.
Products Associated with CVE-2026-21589
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Affected Versions
Atlassian Bamboo Data Center:- Version All other versions is affected.
- Version Patch version 10.2.4 and later is unaffected.
- Version Patch version 12.1.12 and later is unaffected.
- Version All versions is affected.
- Version All other versions is affected.
- Version Patch version 10.2.8 and later is unaffected.
- Version Patch version 10.5.1 and later is unaffected.
- Version Patch version 9.4.26 and later is unaffected.
- Version All versions is affected.
- Version All other versions is affected.
- Version Patch version 10.2.19 and later is unaffected.
- Version Patch version 9.2.26 and later is unaffected.
- Version All versions is affected.
- Version All other versions is affected.
- Version Patch version 7.2.4 and later is unaffected.
- Version Patch version 7.1.1 and later is unaffected.
- Version Patch version 7.0.3 and later is unaffected.
- Version Patch version 6.3.7 and later is unaffected.
- Version All versions is affected.
- Version All other versions is affected.
- Version Patch version 4.9.15 and later is unaffected.
- Version All other versions is affected.
- Version Patch version 4.9.15 and later is unaffected.
- Version All other versions is affected.
- Version Patch version 4.9.15 and later is unaffected.
- Version All other versions is affected.
- Version Patch version 4.9.15 and later is unaffected.
- Version All other versions is affected.
- Version Patch version 11.3.12 and later is unaffected.
- Version Patch version 10.3.26 and later is unaffected.
- Version Patch version 5.12.40 and later is unaffected.
- Version All other versions is affected.
- Version Patch version 5.12.40 and later is unaffected.
- Version All other versions is affected.
- Version Patch version 11.3.12 and later is unaffected.
- Version Patch version 10.3.26 and later is unaffected.
- Version Patch version 9.12.40 and later is unaffected.
- Version All other versions is affected.
- Version Patch version 9.12.40 and later is unaffected.