Critical Atlassian Flaw Lets Unauthenticated Attackers Read Known Files Across 8 Products

Summary

A critical flaw in 8 Atlassian Data Center products, which customers host themselves, allows an attacker with no login access to read specific files in each product's web application root directory. The attacker must already know a file's exact name and path and cannot list what the directory holds. Atlassian disclosed the flaw, CVE-2026-21589, on October 5, rated it 9.3 out of 10, and

Lotu Radar provides attributed news summaries and links to the original publisher. Full reporting and copyright remain with the source.