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CVE-2026-21589

Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability

  • Critical 9.3
  • Exploited: added to CISA KEV 15 Oct 2026

Description

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 allows an unauthenticated attacker to access specific files within the web application root directory in affected versions. Exploitation requires prior knowledge of the target file's exact name and path; this vulnerability does not allow attackers to enumerate or list directory contents. In some configurations, there may be some sensitive files that make this highly severe. This vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions. The vulnerability must be addressed for affected versions of: -- Bitbucket Data Center, introduced in version >= 4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1 -- Confluence Data Center, introduced in version >= 5.10.0, fix versions 9.2.26, 10.2.19 -- Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3, 7.1.7, 7.2.4 -- Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26, 11.3.12 -- Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40, 10.3.26, 11.3.12 -- Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12 -- Crucible, fix versions 4.9.15 -- Fisheye, fix version 4.9.15 -- Exploitation requires prior knowledge of the target file's exact name and path. The vulnerability does not include the capability to enumerate or list directory contents.

Key facts

Published
5 Oct 2026
Last changed
29 Oct 2026
Assigned by
atlassian
KEV added
15 Oct 2026
KEV fix due
18 Oct 2026
EPSS
99.664% likely to be exploited in the next 30 days, higher than 99.95% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.3CVSS 4.0, Criticalfrom the CNA (atlassian)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H

What to do

  • Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
AtlassianBamboo Data Center
  • All other versions (affected)
  • Patch version 10.2.24 and later (unaffected)
  • Patch version 12.1.12 and later (unaffected)
AtlassianBitbucket Data Center
  • All other versions (affected)
  • Patch version 10.2.8 and later (unaffected)
  • Patch version 10.5.1 and later (unaffected)
  • Patch version 9.4.26 and later (unaffected)
AtlassianConfluence Data Center
  • All other versions (affected)
  • Patch version 10.2.19 and later (unaffected)
  • Patch version 9.2.26 and later (unaffected)
AtlassianCrowd Data Center
  • All other versions (affected)
  • Patch version 7.2.4 and later (unaffected)
  • Patch version 7.1.7 and later (unaffected)
  • Patch version 7.0.3 and later (unaffected)
  • Patch version 6.3.7 and later (unaffected)
AtlassianCrucible Data Center
  • All other versions (affected)
  • Patch version 4.9.15 and later (unaffected)
AtlassianFisheye Data Center
  • All other versions (affected)
  • Patch version 4.9.15 and later (unaffected)
AtlassianJira Service Management Data Center
  • All other versions (affected)
  • Patch version 11.3.12 and later (unaffected)
  • Patch version 10.3.26 and later (unaffected)
  • Patch version 5.12.40 and later (unaffected)
AtlassianJira Software Data Center
  • All other versions (affected)
  • Patch version 11.3.12 and later (unaffected)
  • Patch version 10.3.26 and later (unaffected)
  • Patch version 9.12.40 and later (unaffected)

Timeline

  1. 5 Oct 2026 Published
  2. 15 Oct 2026 Added to the CISA KEV catalogue

Weakness

Related coverage

References