CVE-2026-57300 Jenkins MCP Server Plugin missing a permission check
Attackers with Item/Read permission can read Pipeline replay scripts of accessible jobs due to a missing permission check in the Jenkins MCP Server Plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-57300?
CVE-2026-57300 is a medium-severity missing authorization vulnerability in Jenkins MCP Server Plugin, published on 24 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-57300?
2 open source packages ship an affected version, including io.jenkins.plugins:mcp-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
io.jenkins.plugins:mcp-server Maven | All versions | 0.178.vffe5a |
io.jenkins.plugins:mcp-server Maven | All versions | 0.178.vffe5a |
Products include Jenkins Mcp Server.
How do I fix CVE-2026-57300?
Upgrade io.jenkins.plugins:mcp-server to 0.178.vffe5a or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-57300 being exploited?
There is no known exploitation of CVE-2026-57300 in the wild and no public exploit code.
Other vulnerabilities in Jenkins MCP Server Plugin
Sources
Also known as GHSA-mpff-xhg4-vr45.