Atlassian Multiple Products
YES - ON THE CISA KEV LIST
CVE-2026-21589
Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability
24 days past due
Atlassian: 14 entries (0.8% of all KEV entries are from this vendor); 1 added in 2026.
BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.
Your BOD 26-04 window (SSVC tier helper)
Your remediation window ends:
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.
Required action (CISA)
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.
Notes
https://confluence.atlassian.com/security/cve-2026-21589-arbitrary-file-access-vulnerability-impacts-multiple-products-1870495748.html?ref=labs.watchtowr.com ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-21589
References
Other KEV entries for this vendor: Atlassian
- CVE-2021-26086 - Jira Server and Data Center (2024-11-12)
- CVE-2023-22527 - Confluence Data Center and Server (2024-01-24)
- CVE-2023-22518 - Confluence Data Center and Server (2023-11-07)
- CVE-2023-22515 - Confluence Data Center and Server (2023-10-05)
- CVE-2022-36804 - Bitbucket Server and Data Center (2022-09-30)
- CVE-2022-26138 - Confluence (2022-07-29)
- CVE-2022-26134 - Confluence Server/Data Center (2022-06-02)
- CVE-2021-26085 - Confluence Server (2022-03-28)
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