CVE-2026-21589: Critical Pre-Authentication File Read Affects Atlassian Data Center Products

Atlassian has released an out-of-band security advisory for CVE-2026-21589, a critical arbitrary file access vulnerability affecting a broad range of its Data Center products. The flaw carries a CVSS 4.0 score of 9.3 and can be exploited remotely without authentication or user interaction. Because vulnerable functionality is shared across the Atlassian product ecosystem, every previous […] The post CVE-2026-21589: Critical Pre-Authentication File Read Affects Atlassian Data Center Products appeared first on Blog .