CVE-2025–59474: When a Missing Permission Check Let Anyone See Your Jenkins Agent Names

Not every vulnerability needs to hand attackers code execution to be worth fixing. CVE-2025–59474, a missing permission check in Jenkins Core, is a good example: it doesn’t let anyone run commands, but it does hand out infrastructure intel to anyone who asks, no login required.

What Is CVE-2025–59474?

The flaw lives in Jenkins Core (org.jenkins-ci.main:jenkins-core), specifically in a UI component called the sidepanel view. This is the same component that manages the coordination between agents and executors and renders job views across the Jenkins interface.

Why the Sidepanel Leaked Agent Names

The sidepanel includes an executor’s widget that lists agent and executor names. The problem: it rendered that list without checking whether the requesting user actually had Overall/Read permission, the baseline permission Jenkins normally requires before showing anything meaningful. That gap meant unauthenticated or low-privilege users could trigger the sidepanel view and pull agent names straight out of it.

On its own, an agent’s name might look harmless. But names often reveal naming conventions, environment tiers (production versus staging), or hints about internal architecture. Exactly the kind of detail attackers use to map a target before deciding where to strike.

How Attackers Could Use This

Exposed agent names give attackers a head start on reconnaissance. They can use that information to identify which hosts are likely production versus internal test systems, then fold it into phishing or social engineering attempts targeting the teams running those systems or use it to plan more targeted attacks against specific agents or executors. Organizations running large, distributed Jenkins clusters, particularly DevOps-heavy teams and software companies with many build nodes, carry the most exposure here.

The Fix

The patch, delivered through the Jenkins Core update, stops the sidepanel from rendering users who lack Overall/Read permission. The change specifically touches core/src/main/resources/hudson/model/View/sidepanel.jelly, ensuring authorization checks are consistently enforced wherever that view gets called.

Why This Keeps Happening

This bug fits a familiar pattern in Jenkins, and similar automation platforms: UI components and Jelly/Stapler-based templates don’t always get the same security scrutiny as core logic or plugin code. Combine that with organizations that hand out broader permissions than necessary, and older Jenkins installs that lag on patching, and small oversights like this one persist longer than they should.

Mitigation Checklist

• Upgrade to the patched Jenkins Core version
• Apply least-privilege access; don’t grant more permissions than a role needs
• Audit Jelly templates, plugin code, and UI fragments for missing permission checks, not just backend logic
• Use role-based access control plugins to tighten segmentation
• Schedule regular penetration tests against Jenkins environments, including UI-level checks

The Bigger Picture

CVE-2025–59474 is a reminder that information disclosure bugs matter even without a direct path to RCE. As CI/CD platforms keep expanding their UI surface, permission checks need to apply everywhere sensitive data renders, not just on the obvious admin pages. Consistent authorization enforcement, not just strong authentication, is what actually closes these gaps.

Read the full article on: CVE-2025–59474: When a Missing Permission Check Let Anyone See Your Jenkins Agent Names