CVE-2026-21589 Atlassian Multiple Products Files or Directories Accessible to External Parties
Unauthenticated attackers can access specific files in the web application root directory if they know the exact path, potentially exposing sensitive data.
- Exploited in the wild
- Since 15 Oct 2026
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21589?
CVE-2026-21589 is a critical path traversal vulnerability in Atlassian Crucible, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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. This vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions. 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, 7.1.7, 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.
Weakness: CWE-552
Which versions are affected by CVE-2026-21589?
It affects 10 products.
Products include Atlassian Bamboo, Atlassian Bitbucket Data Center, Atlassian Bitbucket Server, Atlassian Confluence Data Center, Atlassian Crowd, Atlassian Crucible and 4 more.
How do I fix CVE-2026-21589?
No fix has been published for CVE-2026-21589 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 18 Oct 2026.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-21589 being exploited?
Yes. Attackers have exploited CVE-2026-21589 in the wild since at least 15 Oct 2026.
Public exploit code: 1 Nuclei template and 13 proofs of concept on GitHub.
Other vulnerabilities in Atlassian Crucible
Sources
Also known as GHSA-gr66-x5pq-8g2g.