CVE-2026-25963: Fleet: Authorization Bypass in certificate template batch deletion for team administrators
Summary
A broken authorization check in Fleet’s certificate template deletion API could allow a team administrator to delete certificate templates belonging to other teams within the same Fleet instance.
Impact
Fleet supports certificate templates that are scoped to individual teams. In affected versions, the batch deletion endpoint validated authorization using a user-supplied team identifier but did not verify that the certificate template IDs being deleted actually belonged to that team.
As a result, a team administrator could delete certificate templates associated with other teams, potentially disrupting certificate-based workflows such as device enrollment, Wi-Fi authentication, VPN access, or other certificate-dependent configurations for the affected teams.
This issue does not allow privilege escalation, access to sensitive data, or compromise of Fleet’s control plane. Impact is limited to integrity and availability of certificate templates across teams.
Patches
- v4.80.1
Workarounds
If an immediate upgrade is not possible, administrators should restrict access to certificate template management to trusted users and avoid delegating team administrator permissions where not strictly required.
For more information
If there are any questions or comments about this advisory:
Email Fleet at security@fleetdm.com Join #fleet in osquery Slack
Credits
Fleet thanks @secfox-ai for responsibly reporting this issue.
Other sources
Fleet is open source device management software. In versions prior to 4.80.1, a broken authorization check in Fleet’s certificate template deletion API could allow a team administrator to delete certificate templates belonging to other teams within the same Fleet instance. Fleet supports certificate templates that are scoped to individual teams. In affected versions, the batch deletion endpoint validated authorization using a user-supplied team identifier but did not verify that the certificate template IDs being deleted actually belonged to that team. As a result, a team administrator could delete certificate templates associated with other teams, potentially disrupting certificate-based workflows such as device enrollment, Wi-Fi authentication, VPN access, or other certificate-dependent configurations for the affected teams. This issue does not allow privilege escalation, access to sensitive data, or compromise of Fleet’s control plane. Impact is limited to integrity and availability of certificate templates across teams. Version 4.80.1 patches the issue. If an immediate upgrade is not possible, administrators should restrict access to certificate template management to trusted users and avoid delegating team administrator permissions where not strictly required.
— MITRE
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-25963?
CVE-2026-25963 is classified as a critical vulnerability due to its potential for authorization bypass.
How do I fix CVE-2026-25963?
To resolve CVE-2026-25963, upgrade Fleet to version 4.80.1 or later.
Who is affected by CVE-2026-25963?
CVE-2026-25963 affects all versions of Fleet prior to 4.80.1.
What type of vulnerability is CVE-2026-25963?
CVE-2026-25963 is an authorization bypass vulnerability in Fleet's certificate template deletion API.
Can a team administrator exploit CVE-2026-25963?
Yes, a team administrator can exploit CVE-2026-25963 to delete certificate templates without proper authorization.