CVE-2026-42522: Jenkins GitHub Branch Source Plugin Missing Permissions Check Allows Attackers Vulnerability

MODERATE
Advisory Identifier: GHSA-wg26-8wmj-cf9p
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CVSS 4.3
CWE-862
Published
Advisory Summary

CVE-2026-42522 is a MODERATE (CVSS 4.3) missing permissions check allows attackers vulnerability (CWE-862: Missing Authorization) affecting Jenkins GitHub Branch Source Plugin libraries in the Maven ecosystem. The issue involves missing permissions check allows attackers to perform a connection test. Remediation is available by upgrading affected packages to version 1967.1969.v205fd594c821.

CVE-2026-42522 at a Glance

CVE Identifier CVE-2026-42522
GHSA Identifier GHSA-wg26-8wmj-cf9p
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-862: Missing Authorization
Affected Product Jenkins GitHub Branch Source Plugin
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-42522

To remediate this vulnerability, upgrade all affected Jenkins GitHub Branch Source Plugin dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.jenkins-ci.plugins:github-branch-source fixed: 1967.1969.v205fd594c821 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>github-branch-source</artifactId>
    <version>1967.1969.v205fd594c821</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-42522, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

Analyze the terminal output to locate any version of Jenkins GitHub Branch Source Plugin in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1967.1969.v205fd594c821), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.plugins command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-862: Missing Authorization, where the product does not perform an authorization check when an actor attempts to access a resource or perform an action. In Jenkins GitHub Branch Source Plugin, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Jenkins GitHub Branch Source Plugin versions 1967.vdea_d580c1a_b_a_ and earlier do not perform a permission check in a method implementing form validation. This allows attackers with Overall/Read permission to connect to an attacker-specified URL with attacker-specified GitHub App credentials. GitHub Branch Source Plugin 1967.1969.v205fd594c821 requires Overall/Manage permission to perform the connection test.

CVE-2026-42522 Affected Jenkins GitHub Branch Source Plugin Versions

1 component(s)
Fixed Versions:
1967.1969.v205fd594c821
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:github-branch-source
maven/org.jenkins-ci.plugins/github-branch-source
Maven
< 1967.1969.v205fd594c821
1967.1969.v205fd594c821

References

NVD — CVE-2026-42522 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42522
Jenkins GitHub Branch Source Plugin Security Information SECURITY
https://www.jenkins.io/security/advisory/2026-04-29/#SECURITY-3702

Frequently Asked Questions

What is CVE-2026-42522?
CVE-2026-42522 is a security vulnerability in Jenkins GitHub Branch Source Plugin involving Missing permissions check allows attackers to perform a connection test under CWE-862: Missing Authorization.
Which Jenkins GitHub Branch Source Plugin versions are affected?
Affected versions include releases prior to 1967.1969.v205fd594c821 across affected packages: org.jenkins-ci.plugins:github-branch-source.
What version fixes CVE-2026-42522?
Upgrading to 1967.1969.v205fd594c821 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github-branch-source affected?
Yes, org.jenkins-ci.plugins:github-branch-source is affected in releases prior to 1967.1969.v205fd594c821. Upgrade your dependency to 1967.1969.v205fd594c821 or later.
What is the CVSS score of CVE-2026-42522?
CVE-2026-42522 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-42522?
CVE-2026-42522 is classified under CWE-862: Missing Authorization (The product does not perform an authorization check when an actor attempts to access a resource or perform an action.).
How can I check Maven dependencies for CVE-2026-42522?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jenkins-ci.plugins'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-wg26-8wmj-cf9p",
  "modified" : "2026-05-06T22:48:34Z",
  "published" : "2026-04-29T15:30:38Z",
  "aliases" : [ "CVE-2026-42522" ],
  "summary" : "Jenkins GitHub Branch Source Plugin: Missing permissions check allows attackers to perform a connection test",
  "details" : "Jenkins GitHub Branch Source Plugin versions 1967.vdea_d580c1a_b_a_ and earlier do not perform a permission check in a method implementing form validation.\n\nThis allows attackers with Overall/Read permission to connect to an attacker-specified URL with attacker-specified GitHub App credentials.\n\nGitHub Branch Source Plugin 1967.1969.v205fd594c821 requires Overall/Manage permission to perform the connection test.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:github-branch-source"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1967.1969.v205fd594c821"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-42522"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2026-04-29/#SECURITY-3702"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-06T22:48:34Z",
    "nvd_published_at" : "2026-04-29T14:16:19Z"
  }
}