CVE-2024-23903 Non-constant time webhook token comparison in Jenkins GitLab Branch Source Plugin

What is CVE-2024-23903?

CVE-2024-23903 is a medium-severity vulnerability in Jenkins GitLab Branch Source Plugin, published on 24 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Jenkins GitLab Branch Source Plugin 684.vea_fa_7c1e2fe3 and earlier uses a non-constant time comparison function when checking whether the provided and expected webhook token are equal, potentially allowing attackers to use statistical methods to obtain a valid webhook token.

Weakness: CWE-697

Which versions are affected by CVE-2024-23903?

2 open source packages ship an affected version, including io.jenkins.plugins:gitlab-branch-source. It affects 1 product.

Products include Jenkins Github Branch Source.

How do I fix CVE-2024-23903?

Upgrade io.jenkins.plugins:gitlab-branch-source to 688.v5fa or later.

Is CVE-2024-23903 being exploited?

There is no known exploitation of CVE-2024-23903 in the wild and no public exploit code.

Other vulnerabilities in Jenkins GitLab Branch Source Plugin

• CVE-2024-23901 Shared projects are unconditionally discovered by Jenkins GitLab Branch Source Plugin Medium 6.5
• CVE-2017-1000091 Jenkins GitHub Branch Source Plugin vulnerable to Cross-Site Request Forgery Medium 6.3
• CVE-2026-57285 Jenkins GitHub Branch Source Plugin has missing permission check that allows enumerating GitHub Enterprise server URLs Medium 4.3
• CVE-2026-42522 Jenkins GitHub Branch Source Plugin: Missing permissions check allows attackers to perform a connection test Medium 4.3
• CVE-2024-23902 CSRF vulnerability in Jenkins GitLab Branch Source Plugin Medium 4.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-f67f-2j6r-m4c9.