Full Report
A vulnerability in Atlassian Data Center products could allow for arbitrary file access. Atlassian Data Center products are self-managed, enterprise-grade editions of Atlassian tools such as Jira, Confluence, Bitbucket, and Jira Service Management, which organizations host on their own infrastructure or private cloud and which offer clustering, high availability, and greater control over data, security, and scaling. Successful exploitation of this vulnerability could allow for arbitrary file access.
Analysis Summary
# Vulnerability: Atlassian Data Center Arbitrary File Access
## CVE Details
- **CVE ID:** CVE-2026-21589
- **CVSS Score:** Not explicitly listed in source (Risk rated as **HIGH** by MS-ISAC)
- **CWE:** CWE-22 (Path Traversal / Arbitrary File Access)
## Affected Systems
- **Products:** Bitbucket, Confluence, Jira Software, Jira Service Management, Bamboo, Crowd, Crucible, and Fisheye (Data Center and self-managed editions).
- **Versions:**
- **Bitbucket Data Center:** Prior to 9.4.26, 10.2.8, and 10.5.1
- **Confluence Data Center:** Prior to 9.2.26 and 10.2.19
- **Jira Software DC:** Prior to 9.12.40, 10.3.26, and 11.3.12
- **Jira Service Management DC:** Prior to 5.12.40, 10.3.26, and 11.3.12
- **Bamboo Data Center:** Prior to 10.2.24 and 12.1.12
- **Crowd Data Center:** Prior to 6.3.7, 7.0.3, 7.1.7, and 7.2.4
- **Crucible and Fisheye:** Prior to 4.9.15
- **Configurations:** Self-managed, enterprise-grade editions (Data Center).
## Vulnerability Description
An unauthenticated attacker can exploit this flaw to access specific files within the web application root directory. The vulnerability is classified under the **Initial Access** tactic via **Exploiting a Public-Facing Application**. While the flaw allows for arbitrary file access, it does **not** allow for directory enumeration; the attacker must have prior knowledge of the target file's exact name and path.
## Exploitation
- **Status:** **Exploited in the wild** (Active exploitation reported).
- **Complexity:** Medium (Requires knowledge of specific file paths).
- **Attack Vector:** Network (Unauthenticated).
## Impact
- **Confidentiality:** **High** (Access to sensitive configuration or system files).
- **Integrity:** Not explicitly listed (Primary risk is data exposure).
- **Availability:** Not explicitly listed.
## Remediation
### Patches
Update to the following versions or higher:
- **Bitbucket:** 9.4.26 / 10.2.8 / 10.5.1
- **Confluence:** 9.2.26 / 10.2.19
- **Jira Software:** 9.12.40 / 10.3.26 / 11.3.12
- **Jira Service Management:** 5.12.40 / 10.3.26 / 11.3.12
- **Bamboo:** 10.2.24 / 12.1.12
- **Crowd:** 6.3.7 / 7.0.3 / 7.1.7 / 7.2.4
- **Crucible/Fisheye:** 4.9.15
### Workarounds
No specific configuration workarounds were provided; immediate patching is the primary recommendation.
## Detection
- **Indicators of Compromise:** Monitor web server logs for unusual requests targeting sensitive files (e.g., config files, `.xml`, `.properties`) within the web application root.
- **Detection Methods:**
- Conduct application penetration testing (Safeguard 16.13).
- Perform automated vulnerability scanning (Safeguard 7.1/1016).
## References
- hxxps://confluence.atlassian[.]com/security/cve-2026-21589-arbitrary-file-access-vulnerability-impacts-multiple-products-1870495748.html
- hxxps://cve.mitre[.]org/cgi-bin/cvename.cgi?name=CVE-2026-21589
- hxxps://www.helpnetsecurity[.]com/2026/10/06/atlassian-data-center-cve-2026-21589/