GHSA-wg26-8wmj-cf9p: org.jenkins-ci.plugins:github-branch-source (CVE-2026-42522)

Jenkins GitHub Branch Source Plugin: Missing permissions check allows attackers to perform a connection test

CVSS 4.3 MediumEPSS 0.0018 · 8th percentile

Published by the GitHub Advisory Database at 29 Apr 2026, 15:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
org.jenkins-ci.plugins:github-branch-source	Maven	<1967.1969.v205fd594c821	1967.1969.v205fd594c821

Identifiers

GHSA-wg26-8wmj-cf9p · CVE-2026-42522

Weakness (CWE)

CWE-862

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Jenkins GitHub Branch Source Plugin versions 1967.vdea_d580c1a_b_a_ and earlier are vulnerable. An attacker with Overall/Read permission can trigger a connection test to an attacker-specified URL using attacker-specified GitHub App credentials, because a form validation method lacks a permission check. Upgrade to version 1967.1969.v205fd594c821, which requires Overall/Manage permission to run the connection test.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.3	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	GitHub Advisory Database

CISA KEV Not listed.
EPSS 0.0018, the 8th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:20 UTC First seen by agentprime
31 Oct 2026, 14:20 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.