CVE-2026-0602 in Community Edition
Summary
by MITRE • 03/11/2026
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.6 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user to disclose metadata from private issues, merge requests, epics, milestones, or commits due to improper filtering in the snippet rendering process under certain circumstances.
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Analysis
by VulDB Data Team • 03/19/2026
This vulnerability represents a critical information disclosure flaw in GitLab's core platform that affects multiple version ranges across the community and enterprise editions. The issue stems from inadequate input validation and filtering mechanisms within the snippet rendering process, which allows authenticated users to access sensitive metadata from private project elements including issues, merge requests, epics, milestones, and commits. The vulnerability exists in versions prior to specific patches released in the 18.7.6, 18.8.6, and 18.9.2 releases, indicating a significant window of exposure for affected organizations. The flaw demonstrates a clear breakdown in access control mechanisms that should have prevented unauthorized metadata exposure from private project components.
The technical root cause of this vulnerability lies in the improper filtering implementation within GitLab's snippet rendering functionality. When processing user-generated content or code snippets, the system fails to adequately sanitize or validate input parameters that could potentially reference private project metadata. This weakness enables an authenticated attacker to craft specific requests that bypass normal access controls, allowing them to extract metadata from private project elements that should only be accessible to authorized team members. The vulnerability operates under specific circumstances that suggest a complex interaction between multiple system components, particularly those involved in rendering and processing user content within the GitLab interface. This type of flaw aligns with CWE-20, which describes improper input validation, and represents a classic case of insufficient access control enforcement.
The operational impact of this vulnerability extends beyond simple metadata disclosure, as it could enable attackers to gain insights into project structure, development timelines, and team activities through the exposure of private issue trackers, merge request histories, and commit metadata. Attackers could potentially use this information to plan targeted attacks, identify system weaknesses, or exploit other vulnerabilities within the project ecosystem. The exposure of private epics and milestones could reveal strategic planning information, while access to commit metadata might provide insights into development practices and potential security gaps. Organizations using affected GitLab versions face significant risks to their intellectual property and operational security, as the vulnerability could be exploited to gather intelligence about their development processes and project dependencies.
Organizations should immediately implement the recommended security patches for GitLab versions 18.7.6, 18.8.6, and 18.9.2 to address this vulnerability. Additionally, security teams should conduct comprehensive audits of their GitLab installations to identify any potential exploitation attempts and review access logs for suspicious activity. The remediation process should include verification that all users have been upgraded to patched versions and that proper access controls remain intact. Organizations may also consider implementing additional monitoring and logging around snippet rendering processes to detect potential abuse attempts. This vulnerability highlights the importance of maintaining up-to-date security practices and demonstrates how seemingly isolated functionality can create significant exposure when access control mechanisms are insufficient. The incident underscores the need for robust input validation and proper privilege enforcement in collaborative development platforms, aligning with ATT&CK technique T1078 for valid accounts and T1566 for credential harvesting through social engineering or compromised access.