CVE-2026-1663 in Community Edition
Summary
by MITRE • 03/11/2026
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 14.4 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user with group import permissions to create labels in private projects due to improper authorization validation in the group import process under certain circumstances.
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Analysis
by VulDB Data Team • 03/14/2026
The vulnerability identified as CVE-2026-1663 represents a critical authorization bypass flaw within GitLab Community Edition and Enterprise Edition platforms. This security weakness affects multiple version ranges including 14.4 through 18.7.5, 18.8 through 18.8.5, and 18.9 through 18.9.1, demonstrating the widespread nature of the authorization validation failure. The flaw specifically targets the group import functionality and occurs when authenticated users possess group import permissions but are able to manipulate the system to create labels in private projects where they should not have such access rights. This type of vulnerability directly impacts the core security model of GitLab's access control mechanisms and represents a significant deviation from expected authorization behavior.
The technical implementation of this vulnerability stems from inadequate validation of user permissions during the group import process. When users with group import privileges attempt to import groups, the system fails to properly verify whether these users should have the ability to create labels within private projects. This authorization bypass allows malicious or compromised users to escalate their privileges beyond what is intended by the system's access control policies. The flaw operates under specific circumstances that must be present for exploitation to occur, suggesting that the vulnerability may require particular conditions or workflows to be triggered successfully. This characteristic makes the vulnerability more targeted but potentially more dangerous when the triggering conditions are met.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it allows unauthorized label creation in private projects which can have significant consequences for project confidentiality and security. Labels in GitLab often serve as metadata for issue tracking and project organization, and their unauthorized creation could lead to information disclosure, manipulation of project tracking systems, or disruption of normal workflow processes. Private projects typically contain sensitive information and restricted access controls, making this vulnerability particularly dangerous for organizations that rely on GitLab for managing confidential code repositories and development workflows. The ability to create labels in private projects without proper authorization could enable attackers to mark issues with specific tags that might be used for further exploitation or to obscure legitimate project activities.
Organizations using affected GitLab versions should immediately implement mitigations to address this vulnerability through the available patches and updates. The remediation process requires updating to the patched versions 18.7.6, 18.8.6, and 18.9.2 respectively, which contain the necessary authorization validation fixes. Security teams should also conduct thorough audits of group import activities and user permissions to identify any potential exploitation attempts. This vulnerability aligns with CWE-285, which addresses improper authorization in software systems, and could potentially map to ATT&CK techniques related to privilege escalation and persistence within development environments. Organizations should also consider implementing additional monitoring controls around group import operations and label creation activities to detect anomalous behavior that might indicate exploitation attempts. The vulnerability demonstrates the importance of comprehensive authorization validation throughout all system processes, particularly in complex enterprise platforms where multiple permission levels and access controls must be properly enforced.