Critical Atlassian Data Center vulnerability CVE-2026-21589

Critical Atlassian Data Center vulnerability CVE-2026-21589

Atlassian has disclosed CVE-2026-21589, a critical unauthenticated arbitrary file access vulnerability affecting Bitbucket Data Center, Confluence Data Center, Jira Software and Jira Service Management Data Center, Bamboo Data Center, Crowd Data Center, Crucible and Fisheye.

Attackers who know a file's exact path can read files within the web application root, and sensitive configurations may expose credentials or other high-value data. A

tlassian recommends upgrading immediately to a fixed release, or restricting internet access and applying its documented mitigations until patching is complete.

SecPoint Penetrator can help organizations review externally reachable systems and prioritize remediation.

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