CVE-2026-15831 in GitLab
Summary
by MITRE • 07/29/2026
GitLab has remediated an issue in GitLab EE affecting all versions from 19.1 before 19.1.3 and 19.2 before 19.2.1 that under certain conditions could have allowed an authenticated user to bypass administrator-configured tool governance policies due to improper authorization enforcement during token generation.
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Analysis
by VulDB Data Team • 07/29/2026
This vulnerability represents a critical authorization flaw in GitLab Enterprise Edition that undermines administrative security controls designed to govern tool usage within the platform. The issue stems from inadequate access control enforcement during token generation processes, allowing authenticated users to circumvent policy restrictions that should be enforced by administrators. The flaw affects versions prior to 19.1.3 and 19.2.1, indicating a prolonged window of exposure where malicious actors could exploit this weakness to gain unauthorized access to restricted resources or functionality. From a cybersecurity perspective, this vulnerability directly impacts the principle of least privilege and role-based access control mechanisms that are fundamental to secure software development environments.
The technical implementation of this authorization bypass occurs during token generation workflows where the system fails to properly validate user permissions against configured governance policies. This misconfiguration allows authenticated users to request tokens that should be restricted based on their administrative permissions or organizational policies. The vulnerability demonstrates a classic failure in access control validation, where the system assumes that authentication alone is sufficient for authorization decisions rather than enforcing proper policy enforcement during token creation processes. Such flaws typically arise from insufficient input validation and inadequate security checks at critical decision points within the application's authorization logic.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially compromise entire development environments and sensitive code repositories. Administrators who have configured specific tool governance policies to restrict access based on user roles, project requirements, or compliance mandates would find these protections ineffective against authenticated users exploiting this flaw. The implications are particularly severe in organizations that rely on GitLab for managing critical software development workflows where unauthorized access could lead to data exposure, code tampering, or disruption of development processes. This vulnerability directly affects the security posture of development teams and could enable attackers to bypass security controls designed to prevent unauthorized tool usage or access to restricted resources.
Organizations should immediately upgrade to GitLab versions 19.1.3 or 19.2.1 to remediate this issue, as these releases contain the necessary patches to enforce proper authorization checks during token generation. Additionally, administrators should conduct comprehensive audits of their existing governance policies and token configurations to identify any potential exploitation that may have occurred prior to the patch deployment. Security teams should implement monitoring for unusual token generation patterns or unauthorized access attempts that might indicate exploitation of this vulnerability. The remediation process should include verification that administrative policies are properly enforced and that no unauthorized users have gained elevated privileges through this authorization bypass mechanism.
This vulnerability aligns with common weakness enumerations such as CWE-285, which addresses improper authorization in software systems, and maps to attack techniques within the ATT&CK framework under privilege escalation and defense evasion categories. The flaw exemplifies how authorization bypasses can undermine even well-designed security architectures when proper access control validation is not implemented at critical points in application workflows. Organizations should consider implementing additional monitoring and logging controls around token generation activities to detect similar authorization flaws in other software components that may exist within their development environments.