Actively exploited in the wild
Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability
Atlassian - Multiple Products · Listed in the CISA KEV since 2026-10-15. This indicates confirmed attacks in production environments.
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.
CVE-2026-21589
HighCVSS 7.5KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
An Arbitrary File Access vulnerability in Atlassian products (Bitbucket, Confluence, Jira, Bamboo, Crowd, Crucible, Fisheye) allows an unauthenticated attacker to access specific files within the web application root directory. Exploitation requires prior knowledge of the target file's exact name and path; directory enumeration is not possible. In some configurations, sensitive files may be present, making this highly severe.
Risk Assessment
The organization may face risk of sensitive information disclosure if sensitive files exist in the application root directory and an attacker knows their exact location. The vulnerability allows unauthenticated remote access, increasing the potential threat.
Recommendation
Immediately update all affected Atlassian products to the fixed versions specified in the CVE description. Additionally, review the application root directory contents and remove any unnecessary sensitive files.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS