CVE-2026-14341 in GitLab
Summary
by MITRE • 07/29/2026
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 12.8 before 19.0.5, 19.1 before 19.1.3, and 19.2 before 19.2.1 that under certain conditions could have allowed an authenticated user with Maintainer role to modify protected branch configuration due to improper authorization in a projects API endpoint.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 07/29/2026
This vulnerability represents a critical authorization bypass issue within GitLab's access control mechanisms that affected multiple version streams including 12.8 through 19.0.4, 19.1 through 19.1.2, and 19.2 through 19.2.0. The flaw existed in the projects API endpoint where authenticated users possessing only the Maintainer role could manipulate protected branch configurations without proper authorization checks. This represents a direct violation of the principle of least privilege and demonstrates a failure in GitLab's permission validation system. The vulnerability stems from inadequate input sanitization and access control validation within the API layer, allowing privilege escalation through malformed requests that bypassed normal security boundaries.
The technical exploitation of this vulnerability involves leveraging the Maintainer role's legitimate access to project APIs while manipulating request parameters to gain unauthorized modification capabilities over branch protection settings. This type of flaw falls under CWE-285: Improper Authorization, which specifically addresses situations where an attacker can perform actions without proper authorization checks. The impact extends beyond simple privilege escalation as it allows malicious actors to weaken security controls within their target projects, potentially leading to unauthorized code modifications or deployment of malicious changes to protected branches. Attackers could exploit this by crafting API requests that target branch protection endpoints while maintaining their Maintainer credentials, effectively circumventing the intended access controls.
From an operational standpoint, this vulnerability exposes organizations to significant risk as it allows authenticated users with relatively low-privilege roles to undermine core security controls. Protected branches typically serve as critical checkpoints for code quality and security enforcement, making unauthorized modifications particularly dangerous. The vulnerability creates a persistent risk vector that remains active until the affected versions are patched, potentially allowing attackers to establish backdoors or weaken security configurations over extended periods. Organizations using GitLab in production environments face potential exposure to code injection attacks, data integrity violations, and compromise of critical development workflows. This issue aligns with ATT&CK technique T1078.004: Valid Accounts - Cloud Accounts, as it exploits legitimate user credentials to perform unauthorized actions within the system.
The remediation for this vulnerability required GitLab to implement proper authorization checks within the affected API endpoints, ensuring that only users with appropriate permissions can modify protected branch configurations. This typically involves strengthening input validation and access control mechanisms to properly verify user privileges before allowing modifications to security-sensitive configurations. Organizations should immediately upgrade to the patched versions 19.0.5, 19.1.3, or 19.2.1 respectively, while implementing monitoring for suspicious API activity patterns that might indicate exploitation attempts. Security teams should also review existing branch protection policies and ensure proper role assignments to minimize potential impact from similar vulnerabilities in other systems. The fix demonstrates the importance of maintaining robust access control validation throughout all API endpoints and highlights the necessity of regular security audits to identify authorization bypass opportunities within complex software platforms.