{"id":"CVE-2026-46356","revision":"c9b284467d5a41439fad2780cf8d39dc","records":[{"revision":"c9b284467d5a41439fad2780cf8d39dc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46356","aliases":[],"title":"Fleet: IP spoofing allows bypassing API rate limiting","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.","state":0,"publishedAt":"2026-05-14T19:03:50.754+00:00","modifiedAt":"2026-05-14T19:39:08.867+00:00","affected":[{"ecosystem":"Vendor product","name":"fleet","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"fleetdm\",\n                    \"product\": \"fleet\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.80.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-mxmp-wr3w-rvqx","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.80.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46356","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46356","identifiers":["CVE-2026-46356"]},"retained":false,"historicalAffected":[]}],"coverage":[]}