Jenkins MCP Server Plugin missing a permission check

published 2026-06-24 4 mo ago modified 2026-10-25 14 d ago also GHSA-mpff-xhg4-vr45 , EUVD-2026-38781

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits: 0; none known

A missing permission check in Jenkins MCP Server Plugin 0.177.v629fdb_2557fe and earlier allows attackers with Item/Read permission to read the Pipeline replay scripts of jobs they can access.

Patch / fix

fixed in 2 links 2

maven io.jenkins.plugins:mcp-server 0.178.vffe5a
Jenkins Project Jenkins MCP Server Plugin 0.172.174.v9f72da_90a_710, 0.178.vffe5a_e770f3b_

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 4 mo ago (2026-06-24)

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% 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:L/I:N/A:N
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
GitHub	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
maven	io.jenkins.plugins:mcp-server	<0.178.vffe5a	0.178.vffe5a

Affected products

Jenkins Project Jenkins MCP Server Plugin

Classification

Weakness

CWE-862 Missing Authorization

References

github.com /jenkinsci/mcp-server-plugin/commit/ffe5ae770f3bd7e88c99aea3018263af0b2f9cc4
web
jenkins.io /security/advisory/2026-06-24/#SECURITY-3759
vendor-advisory, web
nvd.nist.gov /vuln/detail/CVE-2026-57300
advisory
github.com /jenkinsci/mcp-server-plugin
package
github.com /jenkinsci/mcp-server-plugin/releases/tag/0.178.vffe5a_e770f3b_
web

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