PT-2026-3740 · Go · Github.Com/Fleetdm/Fleet+1

Published 2026-01-20 · Updated 2026-01-20

OSV

CVSS v4.0

7.1

High

Base vector

AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

Summary

A broken access control issue in Fleet allowed authenticated users to access debug and profiling endpoints regardless of role. As a result, low-privilege users could view internal server diagnostics and trigger resource-intensive profiling operations.

Impact

Fleet’s debug/pprof endpoints are accessible to any authenticated user regardless of role, including the lowest-privilege “Observer” role. This allows low-privilege users to access sensitive server internals, including runtime profiling data and in-memory application state, and to trigger CPU-intensive profiling operations that could lead to denial of service.

Patches

• 4.78.3
• 4.77.1
• 4.76.2
• 4.75.2
• 4.53.3

Workarounds

If an immediate upgrade is not possible, users should put the debug/pprof endpoints behind an IP allowlist.

For more information

If you have any questions or comments about this advisory:

Email us at [e-mail] Join #fleet in [osquery Slack](https://join.slack.com/t/osquery/shared invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)

Credits

We thank @secfox-ai for responsibly reporting this issue.

Fix

Missing Authorization

Incorrect Authorization

Weakness Enumeration

CWE-862

CWE-863

Related Identifiers

GHSA-4R5R-CCR6-Q6F6

Affected Products

Github.Com/Fleetdm/Fleet

Github.Com/Fleetdm/Fleet/V4

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-23517 · Security Note
• https://osv.dev/vulnerability/GHSA-4r5r-ccr6-q6f6 · Vendor Advisory
• https://github.com/fleetdm/fleet · Note
• https://github.com/fleetdm/fleet/security/advisories/GHSA-4r5r-ccr6-q6f6 · Note
• https://github.com/fleetdm/fleet/commit/5c030e32a3a9bc512355b5e1bf19636e4e6d0317 · Note
• https://pkg.go.dev/vuln/GO-2026-4334 · Note