On October 5th, Atlassian published patches for multiple products to fix an "Arbitrary File Access" vulnerability [CVE-2026-21589]. An attacker can read arbitrary files in the web application's directory, potentially exposing sensitive information such as configuration files. This directory traversal vulnerability is a little bit different from the textbook case.
Scans for Atlassian vulnerablity (CVE-2026-21589), (Wed, Oct 7th)
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