CVE-2026-27465: Fleet Sensitive Google Calendar Credentials Disclosed Vulnerability

HIGH
Advisory Identifier: GHSA-2v6m-6xw3-6467
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CWE-200 CWE-201
Published
Advisory Summary

CVE-2026-27465 is a HIGH sensitive google calendar credentials disclosed vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Fleet libraries in the Go ecosystem. The issue involves sensitive google calendar credentials disclosed to low-privileged users. Remediation is available by upgrading affected packages to version 4.80.1.

CVE-2026-27465 at a Glance

CVE Identifier CVE-2026-27465
GHSA Identifier GHSA-2v6m-6xw3-6467
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Fleet
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-27465

To remediate this vulnerability, upgrade all affected Fleet dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/fleetdm/fleet/v4 fixed: 4.80.1 
Upgrade github.com/fleetdm/fleet/v4 to 4.80.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/fleetdm/fleet/v4

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-27465, inspect your project dependencies for Fleet:

inspect dependencies for github.com/fleetdm/fleet/v4

Analyze the terminal output to locate any version of Fleet in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.80.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Fleet, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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](mailto:security@fleetdm.com) Join #fleet in [osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw) ### Credits Fleet thanks @secfox-ai for responsibly reporting this issue.

CVE-2026-27465 Affected Fleet Versions

1 component(s)
Fixed Versions:
4.80.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/fleetdm/fleet/v4
golang/github.com/fleetdm/fleet/v4
Go
< 4.80.1
4.80.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/fleetdm/fleet/security/advisories/GHSA-2v6m-6xw3-6467
NVD — CVE-2026-27465 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27465
Security Fix Commit FIX COMMIT
https://github.com/fleetdm/fleet/commit/23fc6804efe785f806f769d6be1f5f05b2e13ec2
Fleet Source Repository REPOSITORY
https://github.com/fleetdm/fleet

Frequently Asked Questions

What is CVE-2026-27465?
CVE-2026-27465 is a security vulnerability in Fleet involving Sensitive Google Calendar credentials disclosed to low-privileged users under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Fleet versions are affected?
Affected versions include releases prior to 4.80.1 across affected packages: github.com/fleetdm/fleet/v4.
What version fixes CVE-2026-27465?
Upgrading to 4.80.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/fleetdm/fleet/v4 affected?
Yes, github.com/fleetdm/fleet/v4 is affected in releases prior to 4.80.1. Upgrade your dependency to 4.80.1 or later.
What CWE is associated with CVE-2026-27465?
CVE-2026-27465 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check Go dependencies for CVE-2026-27465?
Run the dependency tree command: 'inspect dependencies for github.com/fleetdm/fleet/v4'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2v6m-6xw3-6467",
  "modified" : "2026-02-26T19:53:30Z",
  "published" : "2026-02-26T19:53:30Z",
  "aliases" : [ "CVE-2026-27465" ],
  "summary" : "Fleet: Sensitive Google Calendar credentials disclosed to low-privileged users",
  "details" : "### Summary\n\nA 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.\n\n### Impact\n\nFleet 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.\n\nAs 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.\n\nThis issue does not allow escalation of privileges within Fleet or access to device management functionality.\n\n### Patches\n\n- v4.80.1\n\n### Workarounds\n\nIf an immediate upgrade is not possible, administrators should remove the Google Calendar integration from Fleet and rotate the affected Google service account credentials.\n\n### For more information\n\nIf there are any questions or comments about this advisory:\n\nEmail Fleet at [security@fleetdm.com](mailto:security@fleetdm.com)  \nJoin #fleet in [osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)\n\n### Credits\n\nFleet thanks @secfox-ai for responsibly reporting this issue.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/fleetdm/fleet/v4"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.80.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/fleetdm/fleet/security/advisories/GHSA-2v6m-6xw3-6467"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27465"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/fleetdm/fleet/commit/23fc6804efe785f806f769d6be1f5f05b2e13ec2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/fleetdm/fleet"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-201" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-26T19:53:30Z",
    "nvd_published_at" : "2026-02-26T03:16:04Z"
  }
}