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CVE-2026-21589

9.3 critical KEV · due 2026-10-18 exploit ×14 SSVC exploitation: active Analyzed
NVD · CVE.org · CISA KEV

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.

Fix

Public exploits 14

Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.

CISA KEV required action · due 2026-10-18

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.

Added to the catalog 2026-10-15. CISA KEV

Patch, vendor advisory and mitigation references on NVD 8

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

In the news 5

Change history 21

  1. EPSS0.13 → 0.99
  2. Cpes+10 CPE criteria (now 10)NVD modified 2026-10-19 20:31
  3. StatusUndergoing Analysis → AnalyzedNVD modified 2026-10-19 20:31
  4. StatusReceived → Undergoing AnalysisNVD modified 2026-10-19 19:45
  5. CwesCWE-552NVD modified 2026-10-19 19:17
  6. References+10 references (now 10)NVD modified 2026-10-19 19:17
  7. StatusRejected → ReceivedNVD modified 2026-10-19 19:17
  8. Description
    Rejected reason: This CVE's publication may have been a false positive or a mistake. As a result, we have rejected this record.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.
    NVD modified 2026-10-19 19:17
  9. CVSS9.3 (v4.0, 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)NVD modified 2026-10-19 19:17
  10. CwesCWE-552 → NVD modified 2026-10-16 21:17
  11. References-10 references (now 0)NVD modified 2026-10-16 21:17
  12. Cpes-10 CPE criteria (now 0)NVD modified 2026-10-16 21:17
  13. StatusAnalyzed → RejectedNVD modified 2026-10-16 21:17
  14. 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.Rejected reason: This CVE's publication may have been a false positive or a mistake. As a result, we have rejected this record.
    NVD modified 2026-10-16 21:17
  15. CVSS9.3 (v4.0, 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X) → NVD modified 2026-10-16 21:17
  16. Cpes+1 CPE criteria (now 10)NVD modified 2026-10-16 14:19
  17. Cpes+9 CPE criteria (now 9)NVD modified 2026-10-15 19:40
  18. StatusAwaiting Analysis → AnalyzedNVD modified 2026-10-15 19:40
  19. References+1 references (now 10)NVD modified 2026-10-15 18:17
  20. CISA KEVadded to CISA KEV, due 2026-10-18
  21. First seenCVSS 9.3NVD modified 2026-10-14 17:18

Affected (CPE criteria) 10

  • cpe:2.3:a:atlassian:bitbucket_data_center:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:bitbucket_server:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:jira_service_desk:*:*:*:*:data_center:*:*:*
  • cpe:2.3:a:atlassian:jira_service_management:*:*:*:*:data_center:*:*:*
  • cpe:2.3:a:atlassian:bamboo:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:crucible:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:fisheye:*:*:*:*:*:*:*:*

References 10