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FortiGuardLabs is tracking CVE-2026-21589, an arbitrary file access vulnerability affecting multiple Atlassian Data Center products, including Bitbucket, Confluence, and Jira.
No authentication required
Specific files can be accessed if the path is known
UAE and U.S. are seeing the highest activity
Get the full analysis and mitigation guidance: https://www.fortiguard.com/outbreak-alert/atlassian-arbitrary-file-access
Learn more about Fortinet: https://www.fortinet.com/corporate/about-us/about-us
Read our latest blog: https://www.fortinet.com/blog
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Date: October 21, 2026
