CVE-2021-21664

Incorrect permission check in XebiaLabs XL Deploy Plugin allows capturing credentials

An incorrect permission check in Jenkins XebiaLabs XL Deploy Plugin 10.0.1 and earlier allows attackers with Generic Create permission to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing Username/password credentials stored in Jenkins.

The permission check was partially fixed in XebiaLabs XL Deploy Plugin 7.5.9: A permission check was added, but for the wrong permission, still allowing some non-admin users to access the form validation method.

The application does not correctly enforce access controls, allowing a principal to access resources or operations beyond their granted permissions. Typical impact: unauthorized data access or execution of privileged operations.

CVE-2021-21664 has a CVSS score of 6.5 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (10.0.2); upgrading removes the vulnerable code path.

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1. What is CVE-2021-21664? CVE-2021-21664 is a medium-severity incorrect authorization vulnerability in com.xebialabs.deployit.ci:deployit-plugin (maven), affecting versions <= 10.0.1. It is fixed in 10.0.2. The application does not correctly enforce access controls, allowing a principal to access resources or operations beyond their granted permissions.
2. How severe is CVE-2021-21664? CVE-2021-21664 has a CVSS score of 6.5 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of com.xebialabs.deployit.ci:deployit-plugin are affected by CVE-2021-21664? com.xebialabs.deployit.ci:deployit-plugin (maven) versions <= 10.0.1 is affected.
4. Is there a fix for CVE-2021-21664? Yes. CVE-2021-21664 is fixed in 10.0.2. Upgrade to this version or later.
5. Is CVE-2021-21664 exploitable, and should I be worried? Whether CVE-2021-21664 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2021-21664 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2021-21664? Upgrade com.xebialabs.deployit.ci:deployit-plugin to 10.0.2 or later.

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