Summary
Non-constant time webhook token comparison in Jenkins GitLab Branch Source Plugin
Jenkins GitLab Branch Source Plugin 684.vea_fa_7c1e2fe3 and earlier does not use a constant-time comparison function when checking whether the provided and expected webhook token are equal.
This could potentially allow attackers to use statistical methods to obtain a valid webhook token.
GitLab Branch Source Plugin 688.v5fa_356ee8520 uses a constant-time comparison function when validating the webhook token.
Impact
CVE-2024-23903 has a CVSS score of 3.7 (Low). The vector is network-reachable, no 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 (688.v5fa); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
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. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2024-23903? CVE-2024-23903 is a low-severity security vulnerability in io.jenkins.plugins:gitlab-branch-source (maven), affecting versions < 688.v5fa. It is fixed in 688.v5fa.
- How severe is CVE-2024-23903? CVE-2024-23903 has a CVSS score of 3.7 (Low). 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.
- Which versions of io.jenkins.plugins:gitlab-branch-source are affected by CVE-2024-23903? io.jenkins.plugins:gitlab-branch-source (maven) versions < 688.v5fa is affected.
- Is there a fix for CVE-2024-23903? Yes. CVE-2024-23903 is fixed in 688.v5fa. Upgrade to this version or later.
- Is CVE-2024-23903 exploitable, and should I be worried? Whether CVE-2024-23903 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
- What actually determines whether CVE-2024-23903 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.
- How do I fix CVE-2024-23903? Upgrade
io.jenkins.plugins:gitlab-branch-sourceto 688.v5fa or later.