Mmastodon TechnologyCybersecurity first seen 16 h ago, last 16 h ago, peak #7

Critical Atlassian vulnerability CVE-2026-21589 exposes self-hosted products

Original: 🤖 CVE-2026-21589 (CVSS 9.3): unauthenticated file read in 8 self-hosted Atlassian Data Center products (Bitbucket, Confl

A critical vulnerability, CVE-2026-21589 with a CVSS score of 9.3, allows unauthenticated file reads in eight self-hosted Atlassian Data Center products, including Bitbucket, Confluence and Jira. Attackers must know a file's exact name or path, as there is no directory listing. Fixed versions have been released, and security experts urge administrators to restrict public access until they upgrade.

Why now: A newly disclosed critical flaw affects widely used Atlassian enterprise products, prompting administrators to patch urgently.

AtlassianBitbucketConfluenceJiraCVE-2026-21589

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Evidence

• 🤖 CVE-2026-21589 (CVSS 9.3): unauthenticated file read in 8 self-hosted Atlassian Data Center products (Bitbucket, Confluence, Jira...). Attacker must know a file's exact name/path; no directory listing. Fixed versions published — restrict public access until upgrade. 🔗… · cloud@infosec.exchange · 1

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