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Critical CVE-2026-21589 Affects Eight Atlassian Products with CVSS 9.3 Score

Atlassian has disclosed a critical vulnerability tracked as CVE-2026-21589 that impacts eight of its products. The flaw allows unauthenticated access to specific files located in the web application's root directory when an attacker already knows the file name and path. Products affected include 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 rates the issue Critical with a CVSSv4.0 base score of 9.3 and warns that Data Center editions face elevated risk due to potential exposure of sensitive files. The company released patches for all affected products and urges immediate updates, while also providing mitigation steps and indicators of compromise for organizations unable to patch right away.

Security NEXTTranslated from Japanese

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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.

CVSSv4.0AtlassianCVE-2026-21589Bitbucket Data CenterConfluence Data Center
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