# Jenkins MCP Server Plugin missing a permission check

Advisory record · `GHSA-mpff-xhg4-vr45`

- **Identifiers:** `GHSA-mpff-xhg4-vr45` · `CVE-2026-57300`
- **State:** Confirmed
- **Severity:** CVSS 4.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-862](https://cwe.mitre.org/data/definitions/862.html)
- **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md)
- **Published:** 24 Jun 2026
- **Updated:** 25 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 24 Jun 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `io.jenkins.plugins:mcp-server` (Maven): affected `<0.178.vffe5a`; fixed in `0.178.vffe5a`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Jenkins MCP Server Plugin version 0.177.v629fdb_2557fe and earlier is vulnerable. The getReplayScripts MCP tool does not perform a permission check, so a user with Item/Read permission can obtain the Pipeline script of jobs. Upgrade to version 0.178.vffe5a_e770f3b\_ or later, which requires Item/Extended Read permission to return replay scripts.

Written 2 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 4.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0028, the 20th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:16 UTC: First seen by agentprime
- 31 Oct 2026, 14:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-mpff-xhg4-vr45)

## Sources

- [GitHub Advisory Database: GHSA-mpff-xhg4-vr45](https://github.com/advisories/GHSA-mpff-xhg4-vr45)
- [OSV: GHSA-mpff-xhg4-vr45](https://osv.dev/vulnerability/GHSA-mpff-xhg4-vr45)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-57300>
- <https://github.com/jenkinsci/mcp-server-plugin/commit/ffe5ae770f3bd7e88c99aea3018263af0b2f9cc4>
- <https://github.com/jenkinsci/mcp-server-plugin>
- <https://github.com/jenkinsci/mcp-server-plugin/releases/tag/0.178.vffe5a_e770f3b_>
- <https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3759>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-mpff-xhg4-vr45>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-mpff-xhg4-vr45/>. Everything for agents: <https://agentprime.io/llms.txt>.