Descripción
Varios productos de Atlassian (Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible y Fisheye) contienen una vulnerabilidad de archivos o directorios accesibles a terceros externos que podría permitir a un atacante no autenticado acceder a archivos específicos dentro del directorio raíz de la aplicación web en las versiones afectadas.
Acción recomendada
Aplicar las mitigaciones del fabricante y revisar los equipos afectados en busca de señales de compromiso (triaje forense) antes de darlos por remediados. Evaluar la exposición a internet de cada activo para priorizar la aplicación de parches. En servicios en la nube, seguir las recomendaciones de seguridad del proveedor; si no hay mitigaciones disponibles, discontinuar el uso del producto.
Referencia de CISA para agencias federales de EE. UU.: BOD 26-04.
Referencias
- Aviso de confluence.atlassian.com confluence.atlassian.com/security/cve-2026-21589-arbitrary-file-acces…
- BOD 26-04 cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updat…
- Requisitos de triaje forense cisa.gov/news-events/directives/bod-26-04-implementation-guidance-pri…
- Ficha en NVD (NIST) nvd.nist.gov/vuln/detail/CVE-2026-21589
Ver el texto original en inglés (CISA)
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.
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 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
Otras vulnerabilidades de Atlassian en el catálogo
- CVE-2021-26086 Atlassian Jira Server and Data Center Path Traversal Vulnerability Alta 12-11-2024
- CVE-2023-22527 Atlassian Confluence Data Center and Server Template Injection Vulnerability Alta 24-01-2024
- CVE-2023-22518 Atlassian Confluence Data Center and Server Improper Authorization Vulnerability Alta 07-11-2023
- CVE-2023-22515 Atlassian Confluence Data Center and Server Broken Access Control Vulnerability Alta 05-10-2023
- CVE-2022-36804 Atlassian Bitbucket Server and Data Center Command Injection Vulnerability Alta 30-09-2022