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CVE-2026-21589CISA KEV

Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability

CISA lists this Atlassian Multiple Products vulnerability as known exploited. Check the cited references and original publisher guidance for affected products and remediation.

CISA KEVCISA-cited referenceNVD

CISA catalog record

Multiple Atlassian products (Bitbucket Data Center ,Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible and Fisheye) contain a files or directories accessible to external parties vulnerability which could allow an unauthenticated attacker to access specific files within the web application root directory in affected versions.

Product
Multiple Products
Added to KEV
15 Oct 2026
Federal remediation due
18 Oct 2026
Known ransomware use
Not reported
Public detection template
PublicNuclei template · template membership does not establish exploit availability or applicability to your systems.

What changed

  1. Detection template: Nuclei template listed
  2. Detection template: Nuclei template listed
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (16)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeCurrent
  2. 6 Nov 2026 · 17:32:22 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml
  3. 6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Not collected
  4. 6 Nov 2026 · 16:31:02 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml → No longer listed in this observation
  5. 2 Nov 2026 · 17:30:39 UTC Source coverage: public-exploit-codeCurrent
  6. 2 Nov 2026 · 17:30:39 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml
  7. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Not collected
  8. 2 Nov 2026 · 16:27:39 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml → No longer listed in this observation
  9. 29 Oct 2026 · 20:19:26 UTC Public detection templateNuclei template listed
  10. 29 Oct 2026 · 20:19:26 UTC Link: Vendor advisoryhttps://confluence.atlassian.com/security/cve-2026-21589-arbitrary-file-access-vulnerability-impacts-multiple-products-1870495748.html?ref=labs.watchtowr.com → No longer listed in this observation
  11. 29 Oct 2026 · 20:19:26 UTC Link: CISA-cited referencehttps://confluence.atlassian.com/security/cve-2026-21589-arbitrary-file-access-vulnerability-impacts-multiple-products-1870495748.html?ref=labs.watchtowr.com
  12. 28 Oct 2026 · 05:10:29 UTC Public exploit codeNuclei template listed
  13. 28 Oct 2026 · 05:10:29 UTC Source coverage: public-exploit-codeCurrent
  14. 28 Oct 2026 · 05:10:29 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml
  15. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  16. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete

Explore global source statements, affected packages and advisory history for CVE-2026-21589. The catalog has a separate collection scope from Microsoft release records.

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CVE-2026-21589

CISA KEV listing collected · added 15 Oct 2026 · Atlassian · Multiple Products

Multiple Atlassian products (Bitbucket Data Center ,Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible and Fisheye) contain a files or directories accessible to external parties vulnerability which could allow an unauthenticated attacker to access specific files within the web application root directory in affected versions.

CISA source · CISA-cited reference

EPSS unknown / outside the collected prediction scope.

Observed 23 Oct 2026 16:01:26 UTC · Complete immutable risk JSON

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

CVE-2026-21589 · 23 Oct 2026 16:01:26 UTC

Immutable source observations

2 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

29 Oct 2026 14:12:12 UTC

This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center. Crowd Data Center, Crucible and Fisheye. This Arbitrary File Access vulnerability …

cve-program · CVE-2026-21589 · Published

23 Oct 2026 15:48:27 UTC

This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center. Crowd Data Center, Crucible and Fisheye. This Arbitrary File Access vulnerability …

cve-program · CVE-2026-21589 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 7 Nov 07:54 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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