{"id":"CVE-2026-104286","published":"2026-10-01T20:17:24Z","modified":"2026-10-28T20:09:29Z","title":"Fortinet FortiMail Path Traversal Vulnerability","vendor":"Fortinet","product":"FortiMail","tier":"core","eol":null,"description":{"text":"An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2.0 through 7.2.9, FortiMail 7.0 all versions may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.","provenance":"source","from":"NVD"},"summary":{"text":"A path traversal flaw (CWE-22) in Fortinet FortiMail's web interface lets a remote attacker write arbitrary files to the underlying system through crafted HTTP or HTTPS requests. An attacker needs only network access to the device, with no authentication and no user interaction required.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T08:31:16Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.04573,"percentile":0.91597,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2026-10-01","dueDate":"2026-10-04","ransomware":false,"requiredAction":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","notes":"https://fortiguard.fortinet.com/psirt/FG-IR-26-175 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-104286","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-10-01","exploitedFirstSeen":"2026-10-01","ransomware":false,"evidence":[{"url":"https://fortiguard.fortinet.com/psirt/FG-IR-26-175","date":"2026-10-01"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-10-01"}],"evidenceTotal":2,"provenance":"source"},"exploited":true,"otx":{"pulseCount":37,"pulses":[{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"}],"provenance":"machine"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"},{"id":"CWE-158","name":"Improper Neutralization of Null Byte or NUL Character"}],"references":[{"url":"https://fortiguard.fortinet.com/psirt/FG-IR-26-175","tags":["Mitigation","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-104286","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: unauthenticated remote exploit via crafted web requests","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests","start":259,"end":381}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1565.001","name":"Stored Data Manipulation","tactics":["impact"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: arbitrary file write alters stored data","mappingType":"primary_impact","evidence":[{"from":"description","quote":"write arbitrary files on the underlying system","start":300,"end":346}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-91042","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-91042","exploited":true,"exploitedSince":"2026-10-01","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":4,"skipped":1,"earliest":"2026-10-02","earliestUrl":"https://github.com/techupdate24/fortimail-zero-day-cve-2026-104286","repos":[{"name":"techupdate24/fortimail-zero-day-cve-2026-104286","url":"https://github.com/techupdate24/fortimail-zero-day-cve-2026-104286","stars":0,"created":"2026-10-02"},{"name":"kh20134/fortimail-cve-2026-104286-response","url":"https://github.com/kh20134/fortimail-cve-2026-104286-response","stars":0,"created":"2026-10-10"},{"name":"CompleteTech-Security/fortimail-cve-2026-104286-check","url":"https://github.com/CompleteTech-Security/fortimail-cve-2026-104286-check","stars":0,"created":"2026-10-23"},{"name":"maxprog-svg/CVE-2026-104286","url":"https://github.com/maxprog-svg/CVE-2026-104286","stars":0,"created":"2026-10-29"}]},"first":{"date":"2026-10-02","source":"PoC-in-GitHub","url":"https://github.com/techupdate24/fortimail-zero-day-cve-2026-104286"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1565.001"],"provenance":"ai"}],"timeline":[{"date":"2026-10-01","kind":"published","label":"Published 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