CVE-2026-57303: Jenkins Assembla Plugin XXE Vulnerability
Summary
CVE-2026-57303: Jenkins Assembla Plugin has an XXE vulnerability. Affects org.jenkins-ci.plugins:assembla versions < 1.4. No fix is published. How to fix ↓
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Background
The Jenkins Assembla Plugin is designed to integrate Jenkins with Assembla, a project management and collaboration tool. This plugin allows users to manage their Assembla projects directly from Jenkins, facilitating seamless workflows. However, versions 1.4 and earlier of this plugin are vulnerable to XML External Entity (XXE) attacks, which can compromise the security of the Jenkins controller.
Vulnerability Detail
The Jenkins Assembla Plugin fails to configure its XML parser to prevent XXE attacks when processing responses from the Assembla server. This oversight allows attackers who can manipulate the server responses to extract sensitive information from the Jenkins environment or execute server-side request forgery (SSRF) attacks. The vulnerability is classified under CWE-918, indicating a significant risk to the integrity and confidentiality of the system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds provided for this vulnerability. Users should consider disabling the plugin or restricting access to the Assembla server until a fix is released.
Conclusion
The Jenkins Assembla Plugin is currently vulnerable to XXE attacks, which can lead to serious security issues. Users are encouraged to monitor for updates and consider disabling the plugin until a fix is available. Utilizing tools like Vulert can help in identifying vulnerabilities in your applications.
See every vulnerability recorded for org.jenkins-ci.plugins:assembla →
FAQ
An XXE vulnerability allows an attacker to interfere with the processing of XML data, potentially leading to the disclosure of confidential information or server-side request forgery.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
If you cannot update the plugin, consider disabling it or restricting access to the Assembla server until a patch is available.
The CVSS score of this vulnerability is 7.1, indicating a high severity level.
More information can be found in the advisory published on GitHub and the plugin's official documentation.
Related vulnerabilities
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