Attackers target Atlassian file-access flaw CVE-2026-21589

The critical vulnerability affects multiple Atlassian Data Center products and can expose sensitive files under certain conditions. Tracked as CVE-2026-21589, it carries a CVSS score of 9.3. According to The Hacker News, affected products include Bitbucket Data Center, Confluence Data Center and Jira Service Management Data Center.

• The Hacker News reports exploitation attempts began within two hours of public disclosure.

Covered by 3 publishers within 26 hours of the first report.

• The Hacker News: Atlassian Data Center Flaw Draws Exploitation Attempts Within Two Hours of Public Details

Reporting3

THN The Hacker News Atlassian Data Center Flaw Draws Exploitation Attempts Within Two Hours of Public Details · info@thehackernews.com (The Hacker News) 7:49 AM

SAF Security Affairs Atlassian Vulnerability Comes Under Attack Hours After Details Go Public · Pierluigi Paganini 3:26 AM

SW SecurityWeek Attackers Target Critical Atlassian Vulnerability Within Hours of PoC Publication · Eduard Kovacs 10:04 AM

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Topics Data centers