CVE-2022-21713 is a medium-severity vulnerability affecting multiple versions of Grafana, an open-source platform widely used for monitoring and observability. The vulnerability arises from incorrect authorization handling (CWE-863) in several API endpoints related to team management. Specifically, authenticated users can exploit the `/teams/:teamId` endpoint to view data associated with arbitrary team IDs, including those they should not have access to. Similarly, the `/teams/:search` endpoint allows authenticated users to enumerate teams and obtain the total number of teams in the system, regardless of their permissions. Additionally, when the `editors_can_admin` flag is enabled, the `/teams/:teamId/members` endpoint permits authenticated users to retrieve membership information for teams they are not authorized to view. This flaw does not require elevated privileges beyond authentication, but it does require the attacker to be authenticated within the Grafana instance. The vulnerability affects Grafana versions from 5.0.0-beta1 up to but not including 7.5.15, and versions from 8.0.0 up to but not including 8.3.5. No known exploits have been reported in the wild, and no workarounds exist other than upgrading to a patched version. The root cause is insufficient access control checks on team-related API endpoints, leading to unauthorized data disclosure. This can result in leakage of sensitive organizational structure and user membership information, which could be leveraged for further attacks or reconnaissance within the affected environment.

For European organizations, the impact of CVE-2022-21713 primarily concerns confidentiality breaches. Unauthorized disclosure of team membership and organizational structure data can expose sensitive internal information, potentially aiding attackers in crafting targeted phishing campaigns, lateral movement, or privilege escalation attempts. Organizations relying heavily on Grafana for monitoring critical infrastructure, such as energy, finance, healthcare, or government sectors, may face increased risk of information leakage that could compromise operational security. While the vulnerability does not directly allow system control or data modification, the exposure of team and membership data undermines trust boundaries and could facilitate subsequent attacks. Given the widespread adoption of Grafana across European enterprises and public sector entities, especially in countries with advanced digital infrastructure, the vulnerability poses a moderate risk to confidentiality and indirectly to integrity and availability if leveraged in multi-stage attacks.

The primary mitigation is to upgrade affected Grafana instances to versions 7.5.15 or later, or 8.3.5 or later, where the authorization checks have been corrected. Since no workarounds exist, organizations should prioritize patching in their maintenance cycles. Additionally, organizations should audit their Grafana user roles and permissions to ensure that only trusted users have authentication access, minimizing the attack surface. Monitoring API access logs for unusual team-related queries can help detect exploitation attempts. Implementing network segmentation to restrict access to Grafana instances and enforcing strong authentication mechanisms (e.g., multi-factor authentication) can reduce the risk of unauthorized access. Finally, organizations should review the use of the `editors_can_admin` flag and disable it if not strictly necessary, as it expands the scope of the vulnerability.