Access Control Flaw in Fleet Open Source Device Management Software
CVE-2026-23517

6.3MEDIUM

Key Information:

Vendor

Fleetdm

Status
Fleet
Vendor
CVE Published:
21 January 2026

What is CVE-2026-23517?

Fleet, the open-source device management software, has a security flaw related to broken access control. This vulnerability affects multiple versions, allowing authenticated users, even those with low privileges such as the 'Observer' role, to access sensitive debugging and profiling endpoints. As a result, these users can view internal server diagnostics and initiate CPU-intensive profiling operations, potentially leading to service denial. The issue has been addressed in versions 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3. For immediate protection, users are advised to restrict access to debug/pprof endpoints through an IP allowlist while ensuring timely upgrades.

Affected Version(s)

fleet >= 4.78.0, < 4.78.3 < 4.78.0, 4.78.3

fleet >= 4.77.0, < 4.77.1 < 4.77.0, 4.77.1

fleet >= 4.76.0, < 4.76.2 < 4.76.0, 4.76.2

References

https://github.com/fleetdm/fleet/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/fleetdm/fleet/commit/5c030e32a3a9bc512...
x_refsource_MISC

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.