Atlassian Patches Critical CVE-2026-21589 in Eight Data Center Products: What Admins Need to Do Now

Atlassian has disclosed a critical path traversal vulnerability affecting eight of its self-hosted Data Center products, including Jira, Confluence and Bitbucket. Tracked as CVE-2026-21589 with a CVSS score of 9.3, the flaw can allow an unauthenticated party to read certain files from the web application root directory.

Atlassian’s cloud-hosted products have already been fixed. Organizations running their own Data Center instances need to update them.

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