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

published 2026-04-29 6 mo ago modified 2026-10-26 13 d ago also GHSA-wg26-8wmj-cf9p , EUVD-2026-26224

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

maven org.jenkins-ci.plugins:github-branch-source 1967.1969.v205fd594c821

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 6 mo ago (2026-04-29)

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
GitHub	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
maven	org.jenkins-ci.plugins:github-branch-source	<1967.1969.v205fd594c821	1967.1969.v205fd594c821

Affected products

Jenkins Project Jenkins GitHub Branch Source Plugin

Classification

Weakness

CWE-862 Missing Authorization

References

jenkins.io /security/advisory/2026-04-29/#SECURITY-3702
vendor-advisory, web
nvd.nist.gov /vuln/detail/CVE-2026-42522
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary