fleetdm fleet up to 4.78.2 authorization

Summaryinfo

A vulnerability, which was classified as very critical, was found in fleetdm fleet up to 4.53.2/4.75.1/4.76.1/4.77.0/4.78.2. The affected element is an unknown function. Such manipulation leads to authorization. This vulnerability is referenced as CVE-2026-23517. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in fleetdm fleet up to 4.53.2/4.75.1/4.76.1/4.77.0/4.78.2. It has been rated as very critical. Affected by this issue is some unknown functionality. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Fleet is open source device management software. A broken access control issue in versions prior to 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 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. 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. Versions 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 fix the issue. If an immediate upgrade is not possible, users should put the debug/pprof endpoints behind an IP allowlist as a workaround.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-23517 since 01/13/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/27/2026).

Upgrading to version 4.53.3, 4.75.2, 4.76.2, 4.77.1 or 4.78.3 eliminates this vulnerability. Applying the patch 5c030e32a3a9bc512355b5e1bf19636e4e6d0317 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-3349). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• fleetdm

Name

• fleet

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16
• 4.17
• 4.18
• 4.19
• 4.20
• 4.21
• 4.22
• 4.23
• 4.24
• 4.25
• 4.26
• 4.27
• 4.28
• 4.29
• 4.30
• 4.31
• 4.32
• 4.33
• 4.34
• 4.35
• 4.36
• 4.37
• 4.38
• 4.39
• 4.40
• 4.41
• 4.42
• 4.43
• 4.44
• 4.45
• 4.46
• 4.47
• 4.48
• 4.49
• 4.50
• 4.51
• 4.52
• 4.53
• 4.53.0
• 4.53.1
• 4.53.2
• 4.54
• 4.55
• 4.56
• 4.57
• 4.58
• 4.59
• 4.60
• 4.61
• 4.62
• 4.63
• 4.64
• 4.65
• 4.66
• 4.67
• 4.68
• 4.69
• 4.70
• 4.71
• 4.72
• 4.73
• 4.74
• 4.75
• 4.75.0
• 4.75.1
• 4.76
• 4.76.0
• 4.76.1
• 4.77.0
• 4.78.0
• 4.78.1
• 4.78.2

License

• open-source

Website

• Product: https://github.com/fleetdm/fleet/

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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