Executive Summary

On Oct 5, Atlassian released patches for multiple products to fix CVE-2026-21589, an arbitrary file access vulnerability that allows attackers to read any file in the web application directory, potentially exposing sensitive configuration data.

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Intelligence Metadata - Source Publisher: SANS Internet Storm Center - Published Date: 2026-10-07T14:59:33+00:00 - Category: threat-intel

Original Description: On October 5th, Atlassian published patches&#;x26;#;xc2;&#;x26;#;xa0;for multiple products to fix an "Arbitrary File Access" vulnerability &#;x26;#;x5b;CVE-2026-21589&#;x26;#;x5d;. An attacker can read arbitrary files in the web application&#;x26;#;39;s directory, potentially exposing sensitive information such as configuration files.

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