CVE-2026-42522 Jenkins GitHub Branch Source Plugin: Missing permissions check allows attackers to perform a connection test
Attackers with read access can connect to arbitrary URLs using GitHub App credentials due to missing permission checks in the Jenkins plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42522?
CVE-2026-42522 is a medium-severity missing authorization vulnerability in Jenkins GitHub Branch Source Plugin, published on 29 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A missing permission check in Jenkins GitHub Branch Source Plugin 1967.vdea_d580c1a_b_a_ and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL with attacker-specified GitHub App credentials.
Weakness: CWE-862
Which versions are affected by CVE-2026-42522?
2 open source packages ship an affected version, including org.jenkins-ci.plugins:github-branch-source. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.jenkins-ci.plugins:github-branch-source Maven | All versions | 1967.1969.v205fd594c821 |
org.jenkins-ci.plugins:github-branch-source Maven | All versions | 1967.1969.v205fd594c821 |
Products include Jenkins Github Branch Source.
How do I fix CVE-2026-42522?
Upgrade org.jenkins-ci.plugins:github-branch-source to 1967.1969.v205fd594c821 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-42522 being exploited?
There is no known exploitation of CVE-2026-42522 in the wild and no public exploit code.
Other vulnerabilities in Jenkins GitHub Branch Source Plugin
- CVE-2024-23901 Shared projects are unconditionally discovered by Jenkins GitLab Branch Source Plugin
- CVE-2017-1000091 Jenkins GitHub Branch Source Plugin vulnerable to Cross-Site Request Forgery
- CVE-2024-23903 Non-constant time webhook token comparison in Jenkins GitLab Branch Source Plugin
- CVE-2026-57285 Jenkins GitHub Branch Source Plugin has missing permission check that allows enumerating GitHub Enterprise server URLs
- CVE-2024-23902 CSRF vulnerability in Jenkins GitLab Branch Source Plugin
Sources
Also known as GHSA-wg26-8wmj-cf9p.