{"id":"CVE-2026-76519","published":"2026-10-14T17:19:10Z","modified":"2026-10-15T13:47:19Z","title":"Cisco Secure Email Gateway Relative Path Traversal Vulnerability","vendor":"Cisco","product":"Secure Email Gateway","tier":"core","eol":null,"description":{"text":"A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system.\r\n\r\nThis vulnerability is due to improper handling of email attachments when the file reputation service is enabled. An attacker could exploit this vulnerability by sending an email that contains a crafted attachment through an affected device. A successful exploit could allow the attacker to write arbitrary files and execute commands with root privileges on the underlying operating system.","provenance":"source","from":"NVD"},"summary":{"text":"A relative path traversal flaw in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway lets crafted email attachments be handled improperly when the file reputation service is enabled. An unauthenticated remote attacker who sends a crafted attachment through an affected device can write arbitrary files and execute commands with root privileges on the underlying operating system, with no user interaction required.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:14:24Z"},"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":0.02152,"percentile":0.82127,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2026-10-14","dueDate":"2026-10-17","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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp ; ; 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-2026-76519","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-10-14","exploitedFirstSeen":"2026-10-14","ransomware":false,"evidence":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp","date":"2026-10-14"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-10-14"}],"evidenceTotal":2,"provenance":"source"},"exploited":true,"otx":{"pulseCount":24,"pulses":[{"name":"Actively_Exploited_Kev | Oct 31, 2026","url":"https://otx.alienvault.com/pulse/6ae4aefab0c2191cecd41862","created":"2026-10-30"},{"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":"Known_Cve | Oct 23, 2026 | Part 1/3","url":"https://otx.alienvault.com/pulse/6ada23770d71749da2321a29","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Known_Cve | Oct 22, 2026 | Part 2/4","url":"https://otx.alienvault.com/pulse/6ad8d3466c8181f05516bab7","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"}],"provenance":"machine"},"cwes":[{"id":"CWE-23","name":"Relative Path Traversal"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76519","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 email attachment exploits public-facing mail gateway","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"An attacker could exploit this vulnerability by sending an email that contains a crafted attachment","start":320,"end":419}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Command execution as root on the host","mappingType":"primary_impact","evidence":[{"from":"description","quote":"execute commands with root privileges on the underlying operating system","start":523,"end":600}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1105","name":"Ingress Tool Transfer","tactics":["command-and-control"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Arbitrary file write enables tool/payload transfer","mappingType":"primary_impact","evidence":[{"from":"description","quote":"could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system","start":95,"end":202}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-101420","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-101420","exploited":true,"exploitedSince":"2026-10-14","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":1,"skipped":0,"earliest":"2026-10-14","earliestUrl":"https://github.com/Mickysalivan/CVE-2026-76519-Proof-of-concept","repos":[{"name":"Mickysalivan/CVE-2026-76519-Proof-of-concept","url":"https://github.com/Mickysalivan/CVE-2026-76519-Proof-of-concept","stars":0,"created":"2026-10-14"}]},"first":{"date":"2026-10-14","source":"PoC-in-GitHub","url":"https://github.com/Mickysalivan/CVE-2026-76519-Proof-of-concept"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1059","T1105"],"provenance":"ai"}],"timeline":[{"date":"2026-10-14","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76519","provenance":"source"},{"date":"2026-10-14","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/Mickysalivan/CVE-2026-76519-Proof-of-concept","provenance":"source"},{"date":"2026-10-14","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp","provenance":"source"},{"date":"2026-10-14","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-10-14","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-101420","provenance":"source"}],"speed":{"daysToPublicExploit":0,"firstExploitFrom":"PoC-in-GitHub","daysToKev":0},"priority":{"score":76.3,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":10.0,"detail":"added 17 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":16.43,"detail":"percentile 0.8213"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 PoC-in-GitHub repo"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"24 pulses"},{"name":"CVSS severity","points":6.86,"detail":"base score 9.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}