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.
Is CVE-2026-21589 exploited?
Listed in the CISA KEV catalog on 2026-10-15.
Federal remediation due 2026-10-18.
Public exploit code: none found in monitored sources.
Public detection rules exist.
Which products and versions are affected?
Atlassian · Bitbucket · <10.5.1
Atlassian · Bitbucket · <10.2.8
Atlassian · Jira · Software <11.3.12
Atlassian · Bitbucket · <9.4.26
Atlassian · Jira · Software <10.3.26
Atlassian · Bamboo · <12.1.12
Atlassian · Jira · Software <9.12.40
Atlassian · Confluence · <9.2.26
Atlassian · Crucible · <4.9.15
Atlassian · Confluence · <10.2.19
Atlassian · Bamboo · <10.2.24
Atlassian · Jira · Service Management <11.3.12
Atlassian · Jira · Service Management <10.3.26
Atlassian · Jira · Service Management <5.12.40
Atlassian · Fisheye · <4.9.15
Atlassian · Bitbucket Data Center · All other versions
Atlassian · Confluence Data Center · All other versions
Atlassian · Jira Service Management Data Center · All other versions
Atlassian · Jira Software Data Center · All other versions
Is there a patch?
Bitbucket 10.5.1
Bitbucket 10.2.8
Jira Software 11.3.12
Bitbucket 9.4.26
Jira Software 10.3.26
Bamboo 12.1.12
Jira Software 9.12.40
Confluence 9.2.26
Crucible 4.9.15
Confluence 10.2.19
Bamboo 10.2.24
Jira Service Management 11.3.12
Jira Service Management 10.3.26
Jira Service Management 5.12.40
Fisheye 4.9.15
Bitbucket Data Center Patch version 10.2.8 and later, Patch version 10.5.1 and later, Patch version 9.4.26 and later
Confluence Data Center Patch version 10.2.19 and later, Patch version 9.2.26 and later
Jira Service Management Data Center Patch version 11.3.12 and later, Patch version 10.3.26 and later, Patch version 5.12.40 and later
Jira Software Data Center Patch version 11.3.12 and later, Patch version 10.3.26 and later, Patch version 9.12.40 and later