Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-46356— Fleet: IP spoofing allows bypassing API rate limiting

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IP提取逻辑未验证请求头来源，可能导致未经身份验证的攻击者通过伪造客户端IP标头绕过API速率限制，从而进行暴力破解登录或其他滥用攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.28% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
fleetdm fleet < 4.80.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-46356

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Fleet: IP spoofing allows bypassing API rate limiting
Source: CVE Program / CVE List V5
Vulnerability Description
Fleet is open source device management software. Prior to version 4.80.1, a vulnerability in Fleet's IP extraction logic allows unauthenticated attackers to bypass API rate limiting by spoofing client IP headers. This may allow brute-force login attempts or other abuse against Fleet instances exposed to the public internet. Fleet extracted client IP addresses from request headers (`True-Client-IP`, `X-Real-IP`, `X-Forwarded-For`) without validating that those headers originate from a trusted proxy. The extracted IP is used as the key for rate limiting and IP ban decisions. As a result, an attacker could rotate the value of these headers on each request, causing Fleet to treat each attempt as coming from a different client. This effectively bypasses per-IP rate limits on sensitive endpoints such as the login API, enabling unrestricted brute-force or credential stuffing attacks. This issue primarily affects Fleet instances that are directly exposed to the internet without a reverse proxy that overwrites forwarded-IP headers. Instances behind a properly configured proxy or WAF are less affected. Version 4.80.1 contains a patch. If an immediate upgrade is not possible, administrators should ensure Fleet is deployed behind a reverse proxy (e.g., nginx, Cloudflare, AWS ALB) that overwrites `X-Forwarded-For` with the true client IP, and apply rate limiting at the proxy or WAF layer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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IP提取逻辑未验证请求头来源，可能导致未经身份验证的攻击者通过伪造客户端IP标头绕过API速率限制，从而进行暴力破解登录或其他滥用攻击。
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-2026-46356

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-46356

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-46356 (1)

Vendor Pages for CVE-2026-46356 (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-2026-24000 Fleet has a rate limiting bypass via untrusted client IP headers
CVE-2026-24899 Fleet Windows MDM Azure AD JWT Authentication Bypass
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-2026-46356

No comments yet

Leave a comment