{"id":"CVE-2026-34926","published":"2026-05-21T14:16:45Z","modified":"2026-07-23T16:10:00Z","title":"Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability","vendor":"Trend Micro","product":"Apex One","tier":"core","eol":null,"description":{"text":"A directory traversal vulnerability in the Apex One (on-premise) server could allow a pre-authenticated local attacker to modify a key table on the server to inject malicious code to deploy to agents on affected installations.\n\n\r\nThis vulnerability is only exploitable on the on-premise version of Apex One and a potential attacker must have access to the Apex One Server and already obtained administrative credentials to the server via some other method to exploit this vulnerability.","provenance":"source","from":"NVD"},"summary":{"text":"A directory traversal flaw in the on-premise version of Trend Micro Apex One's server allows an attacker to tamper with a key server table so that malicious code is pushed to agents on affected installations. Exploitation requires local access to the Apex One Server, pre-existing administrative credentials obtained by some other means, and no user interaction.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:15:03Z"},"cvss":{"score":6.7,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L","provenance":"source","from":"NVD"},"epss":{"score":0.1342,"percentile":0.9642,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2026-05-21","dueDate":"2026-06-04","ransomware":false,"requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://success.trendmicro.com/en-US/solution/KA-0023430 ; https://nvd.nist.gov/vuln/detail/CVE-2026-34926","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-05-21","exploitedFirstSeen":"2026-05-21","ransomware":false,"evidence":[{"url":"https://jvn.jp/en/vu/JVNVU90583059/","date":"2026-05-21"},{"url":"https://success.trendmicro.com/en-US/solution/KA-0023430","date":"2026-05-21"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-05-21"}],"evidenceTotal":3,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"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":"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"}],"provenance":"machine"},"cwes":[{"id":"CWE-23","name":"Relative Path Traversal"}],"references":[{"url":"https://jvn.jp/en/vu/JVNVU90583059/","tags":["Third Party Advisory"]},{"url":"https://success.trendmicro.com/en-US/solution/KA-0023430","tags":["Vendor Advisory"]},{"url":"https://success.trendmicro.com/ja-JP/solution/KA-0022974","tags":["Vendor Advisory"]},{"url":"https://www.jpcert.or.jp/english/at/2026/at260014.html","tags":["Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34926","tags":["Third Party Advisory","US Government Resource"]}],"techniques":[{"id":"T1078","name":"Valid Accounts","tactics":["initial-access","persistence","privilege-escalation","stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: requires prior valid admin credentials","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"already obtained administrative credentials to the server via some other method","start":376,"end":455}],"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: injected code executes on deployed agents","mappingType":"primary_impact","evidence":[{"from":"description","quote":"inject malicious code to deploy to agents on affected installations","start":158,"end":225}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-31284","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-31284","exploited":true,"exploitedSince":"2026-05-21","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":1,"skipped":0,"earliest":"2026-05-22","earliestUrl":"https://github.com/HORKimhab/CVE-2026-34926","repos":[{"name":"HORKimhab/CVE-2026-34926","url":"https://github.com/HORKimhab/CVE-2026-34926","stars":0,"created":"2026-05-22"}]},"first":{"date":"2026-05-22","source":"PoC-in-GitHub","url":"https://github.com/HORKimhab/CVE-2026-34926"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1078"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"}],"timeline":[{"date":"2026-05-21","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34926","provenance":"source"},{"date":"2026-05-21","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://jvn.jp/en/vu/JVNVU90583059/","provenance":"source"},{"date":"2026-05-21","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-05-21","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-31284","provenance":"source"},{"date":"2026-05-22","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/HORKimhab/CVE-2026-34926","provenance":"source"}],"speed":{"daysToPublicExploit":1,"firstExploitFrom":"PoC-in-GitHub","daysToKev":0},"priority":{"score":72.0,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":5.0,"detail":"added 163 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.28,"detail":"percentile 0.9642"},{"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":"50 pulses"},{"name":"CVSS severity","points":4.69,"detail":"base score 6.7"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}