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Atlassian Data Center products path traversal (CVE-2026-21589)

Vulnerability
First reported
Last updated
Happening score
H score 32
3 unique sources, 5 articles

Summary

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Atlassian disclosed CVE-2026-21589, a path traversal vulnerability in 8 self-hosted Data Center products that can let a no-login attacker read specific files in each product's web application root directory. Atlassian published fixed versions for the affected products and said cloud customers do not need to take action. The advisory also recommends temporary network-blocking mitigations until systems are upgraded.

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Advisory/Mitigation
H score41 First: 02.10.2026 19:20 Last: 02.10.2026 19:20 Sources 1

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Fortinet FortiMail mitigation guidance for CVE-2026-104286

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Linux kernel active exploitation wave (CVE-2025-39964, CVE-2026-53266, CVE-2025-39682)

Exploitation Wave
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CISA orders federal agencies to patch Linux kernel flaws

Public Sector Action
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Red Hat Linux kernel advisory update for active exploitation

Advisory/Mitigation
H score53 First: 19.09.2026 09:24 Last: 19.09.2026 09:24 Sources 1

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Open Happening

Timeline

  1. 06.10.2026 09:58 4 articles · 7d ago

    Atlassian discloses CVE-2026-21589 in eight self-hosted Data Center products

    Initial Disclosure

    Atlassian disclosed CVE-2026-21589, a path traversal flaw affecting 8 self-hosted Data Center products, and said an attacker with no login access could read specific files in each product's web application root directory.

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  2. 06.10.2026 09:58 3 articles · 7d ago

    Atlassian publishes fixed versions and temporary blocking guidance for CVE-2026-21589

    Mitigation Patch Update

    Atlassian published fixed versions for the affected products, said its affected cloud products had already been patched and its investigation found no evidence of exploitation, and advised customers who cannot upgrade immediately to restrict outside access or apply temporary blocking rules on a WAF or reverse proxy, Tomcat RewriteValve, or Bitbucket's urlrewrite.xml.

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