CVE-2026-57300: Mcp server Jenkins MCP Server Plugin Missing Vulnerability

MODERATE
Advisory Identifier: GHSA-mpff-xhg4-vr45
Share
CVSS 4.3
CWE-862
Published
Advisory Summary

CVE-2026-57300 is a MODERATE (CVSS 4.3) jenkins mcp server plugin missing vulnerability (CWE-862: Missing Authorization) affecting Mcp server libraries in the Maven ecosystem. The issue involves jenkins mcp server plugin missing a permission check. Remediation is available by upgrading affected packages to version 0.178.vffe5a.

CVE-2026-57300 at a Glance

CVE Identifier CVE-2026-57300
GHSA Identifier GHSA-mpff-xhg4-vr45
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-862: Missing Authorization
Affected Product Mcp server
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:L/I:N/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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-57300

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

io.jenkins.plugins:mcp-server fixed: 0.178.vffe5a 
<dependency>
    <groupId>io.jenkins.plugins</groupId>
    <artifactId>mcp-server</artifactId>
    <version>0.178.vffe5a</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=io.jenkins.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-57300, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.jenkins.plugins

Analyze the terminal output to locate any version of Mcp server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.178.vffe5a), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.jenkins.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 Mcp server, 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 MCP Server Plugin 0.177.v629fdb_2557fe and earlier does not perform a permission check in the getReplayScripts MCP tool that returns the replay script of a Pipeline build. This allows attackers with Item/Read permission to obtain the Pipeline script of jobs. MCP Server Plugin 0.178.vffe5a_e770f3b_ requires Item/Extended Read permission to return the replay script of a Pipeline build through the getReplayScripts MCP tool.

CVE-2026-57300 Affected Mcp server Versions

1 component(s)
Fixed Versions:
0.178.vffe5a
Product / Package Ecosystem Affected Versions Fixed Version
io.jenkins.plugins:mcp-server
maven/io.jenkins.plugins/mcp-server
Maven
< 0.178.vffe5a
0.178.vffe5a

References

NVD — CVE-2026-57300 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57300
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/mcp-server-plugin/commit/ffe5ae770f3bd7e88c99aea3018263af0b2f9cc4
Mcp server Source Repository REPOSITORY
https://github.com/jenkinsci/mcp-server-plugin
Mcp server Release RELEASE
https://github.com/jenkinsci/mcp-server-plugin/releases/tag/0.178.vffe5a_e770f3b_
Mcp server Security Information SECURITY
https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3759

Frequently Asked Questions

What is CVE-2026-57300?
CVE-2026-57300 is a security vulnerability in Mcp server involving Jenkins MCP Server Plugin missing a permission check under CWE-862: Missing Authorization.
Which Mcp server versions are affected?
Affected versions include releases prior to 0.178.vffe5a across affected packages: io.jenkins.plugins:mcp-server.
What version fixes CVE-2026-57300?
Upgrading to 0.178.vffe5a (or the latest patched release for your respective branch) resolves the vulnerability.
Is mcp-server affected?
Yes, io.jenkins.plugins:mcp-server is affected in releases prior to 0.178.vffe5a. Upgrade your dependency to 0.178.vffe5a or later.
What is the CVSS score of CVE-2026-57300?
CVE-2026-57300 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:L/I:N/A:N.
What CWE is associated with CVE-2026-57300?
CVE-2026-57300 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-2026-57300?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.jenkins.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-mpff-xhg4-vr45",
  "modified" : "2026-09-25T19:19:00Z",
  "published" : "2026-06-24T15:31:48Z",
  "aliases" : [ "CVE-2026-57300" ],
  "summary" : "Jenkins MCP Server Plugin missing a permission check",
  "details" : "Jenkins MCP Server Plugin 0.177.v629fdb_2557fe and earlier does not perform a permission check in the getReplayScripts MCP tool that returns the replay script of a Pipeline build.\n\nThis allows attackers with Item/Read permission to obtain the Pipeline script of jobs.\n\nMCP Server Plugin 0.178.vffe5a_e770f3b_ requires Item/Extended Read permission to return the replay script of a Pipeline build through the getReplayScripts MCP tool.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.jenkins.plugins:mcp-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.178.vffe5a"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-57300"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/mcp-server-plugin/commit/ffe5ae770f3bd7e88c99aea3018263af0b2f9cc4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/mcp-server-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/mcp-server-plugin/releases/tag/0.178.vffe5a_e770f3b_"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3759"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-25T19:18:59Z",
    "nvd_published_at" : "2026-06-24T14:17:36Z"
  }
}