Critical CVE-2026-21589 Affects Eight Atlassian Products with CVSS 9.3 Score
Atlassian has published a security advisory detailing a critical vulnerability, CVE-2026-21589, that affects multiple products. The issue carries a CVSSv4.0 base score of 9.3 and is rated Critical, the highest severity level.
The flaw resides in file-access handling and permits an unauthenticated attacker to reach specific files inside the web-application root directory. Successful exploitation requires prior knowledge of the target file name and path, yet no credentials are needed. Depending on the deployment, these files may contain sensitive information.
The following eight products are confirmed vulnerable:
- Bitbucket Data Center
- Confluence Data Center
- Jira Service Management Data Center
- Jira Software Data Center
- Bamboo Data Center
- Crowd Data Center
- Crucible
- Fisheye
Atlassian released fixed versions for every affected product and strongly recommends immediate installation, especially for Data Center deployments. Organizations that cannot apply updates promptly are advised to restrict access to the applications and to review provided indicators of compromise to detect any prior exploitation.
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