Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability
Description
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.
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.
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Details
- Vendor
- Atlassian
- Product
- Atlassian Data Center
- CVE
- CVE-2026-21589
- Affected versions
- Bitbucket Server 8.14: from 4.6.0 to 8.14.6
Bitbucket Data Center 9.4: from 7.17.0 to 9.4.25 — fixed in 9.4.26
Bitbucket Data Center 10.2: from 9.5.0 to 10.2.7 — fixed in 10.2.8
Bitbucket Data Center 10.5: from 10.3.0 to 10.5.0 — fixed in 10.5.1
Confluence Data Center 9.2: from 5.10.0 to 9.2.25 — fixed in 9.2.26
Confluence Data Center 10.2: from 9.3.0 to 10.2.18 — fixed in 10.2.19
Crowd Data Center 6.3: from 2.11.0 to 6.3.6 — fixed in 6.3.7
Crowd Data Center 7.0: from 7.0.0 to 7.0.2 — fixed in 7.0.3
Crowd Data Center 7.1: from 7.1.0 to 7.1.6 — fixed in 7.1.7
Crowd Data Center 7.2: from 7.2.0 to 7.2.3 — fixed in 7.2.4
Jira Software Data Center 9.12: from 7.1.0 to 9.12.39 — fixed in 9.12.40
Jira Software Data Center 10.3: from 9.13.0 to 10.3.25 — fixed in 10.3.26
Jira Software Data Center 11.3: from 10.4.0 to 11.3.11 — fixed in 11.3.12
Jira Service Desk 4.13: from 3.1.0 to 4.13.27
Jira Service Management Data Center 5.12: from 4.14.0 to 5.12.39 — fixed in 5.12.40
Jira Service Management Data Center 10.3: from 5.13.0 to 10.3.25 — fixed in 10.3.26
Jira Service Management Data Center 11.3: from 10.4.0 to 11.3.11 — fixed in 11.3.12
Bamboo Data Center 10.2: from 7.0.1 to 10.2.23 — fixed in 10.2.24
Bamboo Data Center 12.1: from 11.0.0 to 12.1.11 — fixed in 12.1.12
Crucible 4.9: before 4.9.15 — fixed in 4.9.15
Fisheye 4.9: before 4.9.15 — fixed in 4.9.15 (from the advisory and NVD; check the exact builds in the official advisory) - CVSS score
- 7.5
- Actively exploited
- Yes, listed in the CISA Known Exploited Vulnerabilities catalog
- CISA due date
- October 18, 2026 (deadline for US federal agencies: a good benchmark for you too)
- Source
- CISA KEV – original advisory
- Published
- October 15, 2026
The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.