Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability
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 required action: 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
Read at NIST National Vulnerability Database (CVE API 2.0)
- Vendor
- Atlassian
- Product
- Multiple Products
- EPSS
- 0.99 (p100)
- CISA KEV
- added 15 Oct 2026, due 18 Oct 2026 (14d overdue)
- Exploitation
- observed in the wild
- Fix
- available
- Weakness
- CWE-552
- Exposure class
- Collaboration, Developer platform, Identity
Why it ranks 90 (Critical)
- CISA KEV listed, remediation due 2026-10-18
- EPSS 0.99 (high probability of exploitation)
- Exposed product class: identity
- Widely deployed vendor product (Atlassian)
- Covered by 11 independent sources
- Fix available
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- NIST National Vulnerability Database (CVE API 2.0) (nvd.nist.gov)
- Vendor advisory (confluence.atlassian.com)
- CVE-2026-21589 on this site · NVD · CVE.org · Vulnpedia · KEV
Related coverage
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