CVE-2026-84674 in XL Deploy Plugin
Summary
by MITRE • 09/02/2026
Missing permission checks in Jenkins XebiaLabs XL Deploy Plugin 26.1.0 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 • 09/02/2026
The vulnerability identified in the Jenkins XebiaLabs XL Deploy plugin, specifically affecting versions 26.1.0 and prior releases, represents a critical authorization failure that compromises the confidentiality of sensitive configuration data within a CI/CD pipeline environment. This flaw stems from an insufficient access control mechanism where the application fails to enforce proper permission checks when handling requests related to credential enumeration. In typical Jenkins architectures, credentials are stored in a protected store accessible only by users with specific elevated privileges or those explicitly granted access via role-based access control plugins. However, due to this oversight, any user possessing even minimal Overall/Read permissions can bypass these intended restrictions and retrieve the identifiers of all credentials configured within the system.
From a technical perspective, the root cause lies in the absence of validation logic that verifies whether the requesting user has the requisite authorization level before returning metadata about stored secrets. While Jenkins itself implements robust security models such as Matrix Authorization Strategy or Role-Based Access Control to segment access rights, this plugin does not adequately integrate with these safeguards for credential listing operations. Consequently, an attacker who gains initial foothold through low-privilege accounts can exploit this gap to map out the entire inventory of credentials available in the Jenkins instance. This includes usernames, passwords, API tokens, and SSH keys that are linked to various deployment targets or external services integrated into the automation workflow.
The operational impact of this vulnerability is severe because it facilitates a significant escalation path for attackers aiming to compromise downstream systems. By enumerating credential IDs, an adversary can identify which credentials correspond to production servers, cloud infrastructure providers, database instances, or third-party service APIs. Although the actual secret values are not directly exposed in this specific flaw, knowledge of these identifiers allows an attacker to target subsequent exploitation vectors more effectively. For instance, if other vulnerabilities exist that allow for credential extraction via different API endpoints or if there is a misconfiguration allowing read access to certain types of secrets, the enumerated IDs serve as precise targets for further attacks. This significantly reduces the reconnaissance phase required by threat actors and increases the likelihood of successful lateral movement across the enterprise network.
This issue aligns with CWE-284, which describes Improper Access Control, specifically highlighting failures in enforcing authorization policies during resource access operations. Furthermore, it relates to ATT&CK technique T1078, Valid Accounts, as attackers leverage legitimate but low-level credentials to gather intelligence that aids in deeper penetration. The vulnerability also touches upon CWE-200, Information Exposure, since the disclosure of credential identifiers reveals structural information about the security architecture and available attack surfaces within the Jenkins environment.
To mitigate this risk, organizations must immediately upgrade the XebiaLabs XL Deploy plugin to version 26.1.1 or later, where these permission checks have been corrected to ensure that only users with appropriate administrative privileges can list credential IDs. In addition to patching, administrators should review their Jenkins security configurations and enforce strict role-based access controls using plugins like the Role-Based Authorization Strategy. It is crucial to limit Overall/Read permissions to trusted personnel only and avoid granting broad read access to developers or automated service accounts that do not require visibility into sensitive infrastructure details. Regular audits of plugin versions and continuous monitoring for unauthorized enumeration attempts can further strengthen the security posture against such authorization bypass attacks.