{"id":"CVE-2026-24000","revision":null,"records":[{"revision":"b8deab09add6448fb41fc74b3218da1c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-24000","aliases":[],"title":"Fleet has a rate limiting bypass via untrusted client IP headers","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.","state":0,"publishedAt":"2026-05-14T18:56:39.139+00:00","modifiedAt":"2026-05-14T19:41:20.49+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:L/VA:N/SC:N/SI:N/SA:N","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-j8h8-75h3-jg53","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.80.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-24000","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-24000","identifiers":["CVE-2026-24000"]},"retained":false,"historicalAffected":[]},{"revision":"a4189c37613542c2aa4c11aadf825981","observedAt":"2026-10-28T02:05:54.941+00:00","statement":{"source":"euvd","id":"EUVD-2026-30373","aliases":["CVE-2026-24000","GHSA-j8h8-75h3-jg53"],"title":"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…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"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","score":6.9,"severity":null}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-j8h8-75h3-jg53","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.80.1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30373","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 14, 2026, 6:56:39 PM","dateUpdated":"May 14, 2026, 7:41:20 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-30373","identifiers":["EUVD-2026-30373","CVE-2026-24000","GHSA-j8h8-75h3-jg53"]},"retained":false,"historicalAffected":[]},{"revision":"b8aa865846624e1886fe223969c74e6c","observedAt":"2026-10-27T06:23:38.127+00:00","statement":{"source":"nvd","id":"CVE-2026-24000","aliases":[],"title":"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…","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.","state":0,"publishedAt":"2026-05-14T20:17:01.713+00:00","modifiedAt":"2026-10-26T14:10:00.13+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":6.9,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/fleetdm/fleet/releases/tag/fleet-v4.80.1","https://github.com/fleetdm/fleet/security/advisories/GHSA-j8h8-75h3-jg53"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-24000","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-290"],"productCriteria":["cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-05-14T20:17:01.713","lastModified":"2026-10-26T14:10:00.130"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-24000","identifiers":["CVE-2026-24000"]},"retained":false,"historicalAffected":[]},{"revision":"4602c7200d6246e6a6485ab8dee2c782","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-j8h8-75h3-jg53","aliases":["CVE-2026-24000","GO-2026-5455"],"title":"Fleet has a rate limiting bypass via untrusted client IP headers","description":"### Impact\n\nFleet 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.\n\nFleet determines a client’s public IP address using HTTP headers such as:\n- X-Forwarded-For\n- X-Real-IP\n- True-Client-IP\n\nThese 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.\n\nThis could allow an attacker to bypass per-IP rate limits and increase the effectiveness of brute-force or password-spraying attempts against authentication endpoints.\n\nThis issue does not allow authentication bypass, privilege escalation, data exposure, or remote code execution on its own.\n\n### Workarounds\n\nRun Fleet behind a trusted reverse proxy or load balancer that overwrites client IP headers.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\nEmail us at [security@fleetdm.com](mailto:security@fleetdm.com)\nJoin #fleet in [osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)\n\n### Credits\n\nWe thank @fuzzztf for responsibly reporting this issue.","state":0,"publishedAt":"2026-05-14T13:13:39+00:00","modifiedAt":"2026-06-25T23:11:31.6738193+00:00","affected":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.80.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":null,"severity":null},{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-j8h8-75h3-jg53","https://nvd.nist.gov/vuln/detail/CVE-2026-24000","https://github.com/fleetdm/fleet","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.80.1"],"sourceUrl":"https://github.com/advisories/GHSA-j8h8-75h3-jg53","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-j8h8-75h3-jg53","identifiers":["GHSA-j8h8-75h3-jg53","CVE-2026-24000","GO-2026-5455"]},"retained":false,"historicalAffected":[]},{"revision":"ee88326e9a04436dae0c348652c5e9af","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5455","aliases":["CVE-2026-24000","GHSA-j8h8-75h3-jg53"],"title":"Fleet has a rate limiting bypass via untrusted client IP headers in github.com/fleetdm/fleet","description":"Fleet has a rate limiting bypass via untrusted client IP headers in github.com/fleetdm/fleet","state":0,"publishedAt":"2026-06-25T22:34:31+00:00","modifiedAt":"2026-06-25T23:01:13.6530795+00:00","affected":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.80.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-j8h8-75h3-jg53","https://nvd.nist.gov/vuln/detail/CVE-2026-24000","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.80.1"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5455","license":"OSV · upstream source license applies","key":"osv:GO-2026-5455","identifiers":["GO-2026-5455","CVE-2026-24000","GHSA-j8h8-75h3-jg53"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-28T08:06:21.3224229+00:00","complete":true,"records":1760,"lastAttemptAt":"2026-10-28T08:06:21.3224229+00:00","lastSuccessAt":"2026-10-28T08:06:21.4738044+00:00","error":null,"lastVerifiedAt":"2026-10-28T08:06:21.473805+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-d2186f400c54d65f61687f78bb1a00d184d2e215877d0194d7ed70caee809a44-d3e81f89111bb0d33cac14dd0db97453c7217c57124333cc944f6fba75122549","complete":true,"records":415603,"lastAttemptAt":"2026-10-28T08:06:20.8316261+00:00","lastSuccessAt":"2026-10-28T08:06:20.7809924+00:00","error":null,"lastVerifiedAt":"2026-10-28T08:06:20.8316261+00:00","snapshotPublishedAt":"2026-10-28T07:25:55+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. 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Not a global EPSS backfill.","generation":"2026-10-28T08:06:21.3224229+00:00","complete":true,"records":1093,"lastAttemptAt":"2026-10-28T08:06:21.3224229+00:00","lastSuccessAt":"2026-10-28T08:06:21.4745901+00:00","error":null,"lastVerifiedAt":"2026-10-28T08:06:21.4745902+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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