Atlassian Patches Critical Vulnerabilities in Jira, Confluence, Bitbucket, and Five More Products

Atlassian has disclosed a critical arbitrary file access vulnerability affecting eight products, including Jira, Confluence, and Bitbucket. Tracked as CVE-2026-21589, the flaw has a CVSS score of 9.3. It lets unauthenticated attackers access specific files in an affected application’s web root directory. The advisory, published on October 5, 2026, covers Bitbucket Data Center, Confluence Data Center, Jira Software Data Center, Jira Service Management Data Center, Bamboo Data Center, Crowd Data Center, Crucible, and Fisheye. Atlassian urges customers running affected installations to patch immediately. The vulnerability exposes files within the web application root directory without requiring an attacker to sign in. However,...

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