CVE-2026-57300: A missing permission check in Jenkins MCP Server Plugin 0.177.v629fdb_2557fe and earlier allows attackers with

Q: How do I fix CVE-2026-57300?

mcp server: upgrade to newer than 0.177.v629fdb_2557fe. Exact commands for each OS are on this page.

Q: Is CVE-2026-57300 being exploited?

CVE-2026-57300 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-57300 affect?

CVE-2026-57300 affects mcp server. Severity is medium (CVSS 4.3). 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.

Q: How urgent is CVE-2026-57300?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2026-57300 is a medium-severity flaw (CVSS 4.3) affecting mcp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-06-24
Last modified	2026-10-25

Publisher (CNA): Jenkins Project · Vendor: jenkins

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-24 14:17 UTCPublished CVE record published
2026-10-25 22:10 UTCUpdated Record last modified

jenkins mcp server UPGRADE

Affected: <= 0.177.v629fdb_2557fe

Fixed in: newer than 0.177.v629fdb_2557fe

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mcp-server || rpm -q mcp-server || mcp-server --version

2. UPGRADE to newer than 0.177.v629fdb_2557fe (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mcp-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mcp-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57300?

mcp server: upgrade to newer than 0.177.v629fdb_2557fe. Exact commands for each OS are on this page.

Is CVE-2026-57300 being exploited?

CVE-2026-57300 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57300 affect?

CVE-2026-57300 affects mcp server. Severity is medium (CVSS 4.3). 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.

How urgent is CVE-2026-57300?

Priority 20/100. No elevated risk signals yet.

Software pages

Jenkins vulnerabilities

Related CVEs

CVE-2026-47427 HIGH 7.5 UPGRADE GitHub MCP Server is GitHub's official MCP Server

References

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