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CVE-2026-24000— Fleet has a rate limiting bypass via untrusted client IP headers

Quick assessment

Affected
fleetdm fleet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fleet是Fleet Device Management开源的一个设备管理平台，支持多种操作系统和设备，帮助 IT 和安全团队进行设备管理、漏洞报告、MDM 等操作。 Fleet 4.80.1之前版本存在安全漏洞，该漏洞源于信任客户端提供的IP地址标头而未进行验证，可能导致经过身份验证和未经身份验证的客户端伪造其IP地址并绕过基于IP的速率限制控制。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
fleetdm fleet < 4.80.1 affected
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I. Basic Information for CVE-2026-24000

Vulnerability Information
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Vulnerability Title
Fleet has a rate limiting bypass via untrusted client IP headers
Source: CVE Program / CVE List V5
Vulnerability Description
Fleet is open source device management software. Prior to version 4.80.1, Fleet trusted client-supplied IP address headers when determining the source IP for incoming requests. This allowed authenticated and unauthenticated clients to spoof their apparent IP address and bypass per-IP rate limiting controls. Fleet determines a client’s public IP address using HTTP headers such as X-Forwarded-For, X-Real-IP, and/or True-Client-IP. These headers were trusted without validation. An attacker could supply arbitrary values in these headers, causing Fleet to treat each request as originating from a different IP address. This could allow an attacker to bypass per-IP rate limits and increase the effectiveness of brute-force or password-spraying attempts against authentication endpoints. This issue does not allow authentication bypass, privilege escalation, data exposure, or remote code execution on its own. Version 4.80.1 contains a patch. As a workaround, run Fleet behind a trusted reverse proxy or load balancer that overwrites client IP headers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Fleet 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fleet是Fleet Device Management开源的一个设备管理平台，支持多种操作系统和设备，帮助 IT 和安全团队进行设备管理、漏洞报告、MDM 等操作。 Fleet 4.80.1之前版本存在安全漏洞，该漏洞源于信任客户端提供的IP地址标头而未进行验证，可能导致经过身份验证和未经身份验证的客户端伪造其IP地址并绕过基于IP的速率限制控制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fleetdm fleet < 4.80.1 -

II. Public POCs for CVE-2026-24000

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III. Intelligence Information for CVE-2026-24000

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Vendor Advisories for CVE-2026-24000 (1)

Vendor Pages for CVE-2026-24000 (1)

Same Patch Batch · fleetdm · 2026-05-14 · 6 CVEs total

CVE-2026-26062 Fleet server may terminate unexpectedly when handling certain gRPC requests
CVE-2026-26191 Fleet vulnerable to OS command injection in software packages
CVE-2026-24899 Fleet Windows MDM Azure AD JWT Authentication Bypass
CVE-2026-46356 Fleet: IP spoofing allows bypassing API rate limiting
CVE-2026-23998 Fleet has a Windows MDM management endpoint authentication bypass

IV. Related Vulnerabilities

Same product: fleet
Same vendor: fleetdm
Same weakness: CWE-290

V. Comments for CVE-2026-24000

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