CVE-2026-27465: Fleet: Sensitive Google Calendar credentials disclosed to low-privileged users
Summary
A vulnerability in Fleet’s configuration API could expose Google Calendar service account credentials to authenticated users with low-privilege roles. This may allow unauthorized access to Google Calendar resources associated with the service account.
Impact
Fleet returns configuration data through an API endpoint that is accessible to authenticated users, including those with the lowest-privilege “Observer” role. In affected versions, Google Calendar service account credentials were not properly obfuscated before being returned.
As a result, a low-privilege user could retrieve the service account’s private key material. Depending on how the Google Calendar integration is configured, this could allow unauthorized access to calendar data or other Google Workspace resources associated with the service account.
This issue does not allow escalation of privileges within Fleet or access to device management functionality.
Patches
- v4.80.1
Workarounds
If an immediate upgrade is not possible, administrators should remove the Google Calendar integration from Fleet and rotate the affected Google service account credentials.
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 vulnerability in Fleet’s configuration API could expose Google Calendar service account credentials to authenticated users with low-privilege roles. This may allow unauthorized access to Google Calendar resources associated with the service account. Fleet returns configuration data through an API endpoint that is accessible to authenticated users, including those with the lowest-privilege “Observer” role. In affected versions, Google Calendar service account credentials were not properly obfuscated before being returned. As a result, a low-privilege user could retrieve the service account’s private key material. Depending on how the Google Calendar integration is configured, this could allow unauthorized access to calendar data or other Google Workspace resources associated with the service account. This issue does not allow escalation of privileges within Fleet or access to device management functionality. Version 4.80.1 patches the issue. If an immediate upgrade is not possible, administrators should remove the Google Calendar integration from Fleet and rotate the affected Google service account credentials.
— MITRE
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-27465?
CVE-2026-27465 is classified as a high severity vulnerability due to the potential exposure of sensitive Google Calendar credentials.
How do I fix CVE-2026-27465?
To remediate CVE-2026-27465, upgrade Fleet to version 4.80.1 or later.
Who is affected by CVE-2026-27465?
Authenticated users with low-privilege roles in Fleet versions prior to 4.80.1 are affected by CVE-2026-27465.
What types of credentials are exposed in CVE-2026-27465?
CVE-2026-27465 may expose Google Calendar service account credentials to unauthorized users.
Is there a workaround for CVE-2026-27465 before upgrading?
There are no known workarounds for CVE-2026-27465; the recommended action is to upgrade to a patched version.