Fleet
CVE-2026-23517
HIGH
GHSA-4r5r-ccr6-q6f6
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessAuthenticate as low-privilege Observer user
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DeliveryAccess debug/pprof endpoints
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ExploitView server diagnostics and runtime profiling
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ExecutionTrigger resource-intensive operations
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ImpactCause denial of service
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Authorization checks on every request
MITRE ATT&CK
1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Valid authenticated credentials for any Fleet user account (including lowest-privilege Observer role) with network access to Fleet instance; no administrative role or special configuration required. |
| Impact | CVSS 8.1 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitation requires authentication. |
| Exploit ScenarioDerived | An attacker (requires authentication) could exploit this vulnerability to denial of service. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Fleet device management software versions prior to 4.78.3 suffer from broken access control that permits any authenticated user, including low-privilege observers, to access debug and profiling endpoints. Attackers can leverage this vulnerability to extract sensitive server diagnostics, runtime profiling data, and application state, or trigger CPU-intensive operations resulting in denial of service. The vulnerability affects multiple Fleet versions and has patches available.
Earlier versions of this analysis (1)
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. [CVSS 8.1 HIGH]
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 2 packages in go
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-862 (Missing Authorization). Affects Fleet. 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
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
2DescriptionGitHub Advisory
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.
Executive ViewAI
Organizations using versions face notable risk from CVE-2026-23517, a missing authorization vulnerability rated CVSS 8.1. Attackers could bypass security controls to gain unauthorized access to protected resources and sensitive data. A patch is available and should be applied as part of regular vulnerability management.
Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)GitHub Advisory
Fleet device management software has a signature verification bypass that allows attackers to install malicious firmware
Fleet is an open source osquery manager. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable,
Unauthenticated attackers can bypass authentication in Fleet (versions before 4.87.0) by using non-secret device identif
OS command injection in Fleet's generator for Fleet-maintained macOS app install and uninstall scripts allows crafted Ho
Privilege escalation in SUSE Rancher Fleet (0.14.x before 0.14.11, 0.15.x before 0.15.7, and 0.16.x before 0.16.2) lets
SQL injection in Fleet device management software before version 4.80.1 allows authenticated users to manipulate the ord
Unauthenticated denial of service in FleetDM Fleet before 4.83.0 allows remote attackers to exhaust server memory by sen
Unauthenticated denial-of-service in Fleet Device Management before 4.89.0 allows remote attackers to crash the server b
fleetdm/fleet is an open source device management, built on osquery. Rated high severity (CVSS 8.1), this vulnerability
Fleet before 2.1.2 allows exposure of SMTP credentials. Rated high severity (CVSS 7.5), this vulnerability is remotely e
Cross-tenant authorization bypass in SUSE Rancher Fleet allows a party who can perform agent-initiated cluster registrat
Unauthenticated download of in-house iOS application packages and manifests is possible against enterprise-tier Fleet de
Same weakness CWE-862 – Missing Authorization
View allSame technique Denial Of Service
View allVendor StatusVendor
SUSE
Severity: High| Product | Status |
|---|---|
| openSUSE Leap 15.6 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Fixed |
| openSUSE Leap 15.5 | Fixed |
Exploit-DB