
Canada flags Atlassian Data Center and Server flaws (AV26-1076)
The October 22 alert lists affected Bamboo, Bitbucket, Confluence, Crowd, Fisheye/Crucible, Jira, and Jira Service Management builds.
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The October 22 alert lists affected Bamboo, Bitbucket, Confluence, Crowd, Fisheye/Crucible, Jira, and Jira Service Management builds.

Critical scores are third-party library ratings; Atlassian says its product risk is lower and not immediately critical.

CISA added actively exploited Atlassian CVE-2026-21589 to KEV, ordering federal fixes by October 18, 2026.
Unauthenticated attackers can read a known file in the web root; federal remediation is due October 18, 2026.

Attackers probed critical Atlassian CVE-2026-21589 within hours of a public PoC, with 190 honeypot attempts.

Attackers began exploiting critical Atlassian flaw CVE-2026-21589 within hours of a public proof of concept.
Atlassian urges patches for CVE-2026-21589, an unauthenticated file-read flaw in eight Data Center products.

Wiz published a DFIR cheatsheet covering log visibility, incident readiness, and threat hunting across GitHub, GitLab, Bitbucket, and Azure DevOps.
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