Stapler Framework Unintended Method Invocation Code Execution
Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.
An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier in stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.
Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.
Corroborated threat activity referencing this CVE — with source and confidence, not inference.
Named threat actors and observed ATT&CK techniques appear here as intel feeds are folded in — the ATT&CK chain above stays inferred until then.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
Immediately restrict network access to the Jenkins server and its administrative interfaces to only trusted IP addresses or internal networks. Deploy a Web Application Firewall (WAF) to block requests containing suspicious URL patterns indicative of method invocation attempts. Enhance monitoring for unusual access patterns, particularly requests targeting MetaClass.java or invoking non-standard methods.
The permanent resolution is to upgrade Jenkins to a patched version immediately. Affected versions include Jenkins 2.153 and earlier, and Jenkins LTS 2.138.3 and earlier. Administrators should upgrade to Jenkins 2.154 or later, or Jenkins LTS 2.138.4 or later, as provided by the official Jenkins project.
An attacker can achieve arbitrary code execution on the Jenkins server by crafting malicious URLs that invoke unintended Java methods within the Stapler framework. This allows full compromise of the Jenkins instance, leading to unauthorized access to build artifacts, source code, and credentials. The technical impact is severe, potentially causing data exfiltration, system takeover, and disruption of CI/CD pipelines.
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