CVE-2026-70433 in HCL AppScan Plugin
Summary
by MITRE • 08/05/2026
Missing permission checks in Jenkins HCL AppScan Plugin 1.8.3 and earlier allow attackers with Overall/Read permission to enumerate credentials IDs of credentials stored in Jenkins.
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Analysis
by VulDB Data Team • 08/05/2026
This vulnerability exists within the Jenkins HCL AppScan plugin version 1.8.3 and earlier, where insufficient authorization controls permit attackers with only Overall/Read permission to discover credential identifiers stored within the Jenkins system. The flaw represents a direct violation of the principle of least privilege and demonstrates a critical oversight in access control implementation. Attackers exploiting this vulnerability can enumerate credential IDs through unauthorized API calls or web interface interactions that should typically be restricted to users with elevated privileges such as Overall/Manage or higher permissions.
The technical nature of this vulnerability aligns with CWE-284, which addresses improper access control mechanisms within software applications. This specific weakness manifests as an insufficient authorization check that fails to properly validate user permissions before exposing sensitive credential information. The attack vector leverages the existing read permission structure within Jenkins, where the plugin does not adequately enforce additional security boundaries around credential management functions. This creates a scenario where low-privilege users can bypass normal access controls through predictable API endpoints or interface elements that expose credential identifiers without proper authentication verification.
The operational impact of this vulnerability is significant as it provides attackers with critical information for further exploitation attempts. Once credential IDs are enumerated, attackers can potentially use this information to craft targeted attacks against specific credentials, attempt brute force attacks on associated passwords, or combine this information with other vulnerabilities to escalate privileges within the Jenkins environment. This enumeration capability undermines the fundamental security model of credential storage systems, where credential identifiers should remain hidden from unauthorized users regardless of their general read permissions.
Mitigation strategies should focus on implementing proper authorization controls within the plugin code to ensure that credential ID enumeration is restricted to users with appropriate administrative privileges. Organizations should immediately update to Jenkins HCL AppScan plugin versions 1.8.4 and later where this vulnerability has been addressed through enhanced permission checking mechanisms. System administrators should also conduct thorough privilege reviews to ensure that only authorized personnel maintain Overall/Manage permissions, while implementing additional monitoring controls around credential-related API calls and access patterns. The remediation approach aligns with ATT&CK technique T1552.001 which addresses credentials in files and emphasizes the importance of protecting credential storage systems from unauthorized enumeration attempts. Additional defensive measures include implementing network segmentation to limit access to Jenkins servers, enabling multi-factor authentication for administrative accounts, and deploying intrusion detection systems to monitor for suspicious credential enumeration activities that may indicate exploitation attempts.