Check your Atlassian product and installed version against the fixed-release table below. Atlassian’s October 5, 2026 advisory says all versions of the listed products before their applicable fixes are affected by CVE-2026-21589, a critical arbitrary file access vulnerability. You do not need to test for a live exploit to establish whether a version is in scope.
Which Atlassian products are affected?
The advisory covers Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible, and Fisheye. Atlassian describes the flaw as unauthenticated access to specific files in the web application root. An attacker must already know the exact file name and path; the vulnerability does not provide directory listing or file enumeration.
Atlassian rates CVE-2026-21589 Critical, with a CVSS score of 9.3 from its internal assessment. The advisory does not report a prevalence statistic or exploitation count. Read Atlassian’s CVE-2026-21589 advisory.
How to check your product and version
- Inventory every deployment and cluster node, recording the product name, installed version, and whether it is a Data Center instance. Include Crucible and Fisheye if you operate them.
- Find the matching product row in the table below. Compare your installed version with the fixed release applicable to your product and release line.
- If your version is earlier than the applicable fix, it is within the affected scope described by Atlassian. Plan an upgrade to a listed fixed release or later, checking the product’s release notes and support requirements first.
These are the fixed versions named in Atlassian’s October 5, 2026 advisory. They are not necessarily the latest available releases, and the advisory does not rank the alternatives.
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| Product | Fixed versions listed |
|---|---|
| Bitbucket Data Center | 9.4.26, 10.2.8, 10.5.1 |
| Confluence Data Center | 9.2.26, 10.2.19 |
| Jira Service Management Data Center | 5.12.40, 10.3.26, 11.3.12 |
| Jira Software Data Center | 9.12.40, 10.3.26, 11.3.12 |
| Bamboo Data Center | 10.2.24, 12.1.12 |
| Crowd Data Center | 6.3.7, 7.0.3, 7.1.7, 7.2.4 |
| Crucible | 4.9.15 |
| Fisheye | 4.9.15 |
What to do if your installation is affected
Upgrade as the primary fix
Upgrade each affected installation to a fixed version listed for that product or a later version, following the relevant release notes. For clustered deployments, include every affected installation and relevant node in the upgrade plan; updating only one node can leave the deployment incompletely addressed. Select among listed releases based on compatibility, supported release or LTS path, maintenance requirements, and the time needed to upgrade.
Reduce exposure while an upgrade is pending
If you cannot patch immediately, Atlassian recommends restricting external access where possible, including taking a publicly accessible instance off the internet. This applies even when the instance requires users to authenticate.
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The advisory also describes temporary mitigations: a traversal-pattern block at a web application firewall (WAF) or proxy; a Tomcat RewriteValve configuration for Confluence, Jira Service Management, Jira Software, Bamboo, and Crowd; and a urlrewrite.xml rule for Bitbucket. These procedures are product- and infrastructure-specific. Back up relevant files and test the rule, including URL-encoded patterns, and follow the complete instructions in Atlassian’s advisory rather than copying a rule without its context.
How to investigate possible access attempts
Review access logs for requests that may contain path traversal patterns. Atlassian advises URL-decoding each request line up to two passes and looking for .. immediately adjacent to /, \, or ::. You can also search raw lines with the regular expression provided in the advisory.
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A matching request is an indicator to investigate, not proof that the vulnerability was successfully exploited or that a system was compromised. Atlassian says it cannot confirm whether customer instances have been affected. Ask your local security team to assess suspicious activity and determine whether further incident-response steps are needed.
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