Jenkins MCP Server Plugin missing a permission check (CVE-2026-57300) | HOL Guard CVE

Medium · CVSS 4.3CVE-2026-57300GHSA-MPFF-XHG4-VR45

Jenkins MCP Server Plugin missing a permission check

Answer in brief

CVE-2026-57300 records a Medium severity (CVSS 4.3) vulnerability in Jenkins MCP Server Plugin missing a permission check. The current sources do not mark it as known exploited. The current feed maps io.jenkins.plugins:mcp-server (maven), io.jenkins.plugins:mcp-server (maven). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 24, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Jun 24, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps io.jenkins.plugins:mcp-server (maven), io.jenkins.plugins:mcp-server (maven). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
io.jenkins.plugins:mcp-servermaven	<0.178.vffe5a	0.178.vffe5a
io.jenkins.plugins:mcp-servermaven	>=0 <0.178.vffe5a	0.178.vffe5a

Recommended response

Check inventory. Check lockfiles and deployed manifests for io.jenkins.plugins:mcp-server, io.jenkins.plugins:mcp-server.
Review the reported fix. Update io.jenkins.plugins:mcp-server to 0.178.vffe5a; io.jenkins.plugins:mcp-server to 0.178.vffe5a if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 24, 2026
Evidence: source:ghsa:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:ghsa:source_dates:source-dates:record
First seen by HOL
Jun 24, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.