{"schemaVersion":3,"id":"CVE-2026-34926","aliases":[],"status":"published","duplicateOf":null,"title":"Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability","description":"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\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.","dates":{"published":"2026-05-21T13:03:21.164Z","modified":"2026-05-22T12:47:07.213Z","reserved":null,"kevAdded":["2026-05-21T00:00:00.000Z"],"kevDue":["2026-06-04T00:00:00.000Z"]},"cvss":{"headline":{"score":6.7,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.7,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.7,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00538,"percentile":0.4442,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":-12.143999999999998,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.12682},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00538,"percentile":0.4442}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.12682,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00538,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00538,"percentile":0.4442}]},"kev":{"state":"listed","entries":[{"source":"cisa","sourceLabel":"CISA","dateAdded":"2026-05-21T00:00:00.000Z","dueDate":"2026-06-04T00:00:00.000Z","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.","name":"Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability","description":"Trend Micro Apex One (on-premise) contains a directory traversal vulnerability that 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.","notes":[{"type":"url","href":"https://success.trendmicro.com/en-US/solution/KA-0023430","label":"success.trendmicro.com/en-US/solution/KA-0023430"},{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2026-34926","label":"nvd.nist.gov/vuln/detail/CVE-2026-34926"}],"vendor":"Trend Micro","product":"Apex One","ransomware":false,"ransomwareUse":"Unknown","exploitationType":null}],"listedCount":1,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":true,"entry":{"source":"cisa","sourceLabel":"CISA","dateAdded":"2026-05-21T00:00:00.000Z","dueDate":"2026-06-04T00:00:00.000Z","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.","name":"Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability","description":"Trend Micro Apex One (on-premise) contains a directory traversal vulnerability that 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.","notes":[{"type":"url","href":"https://success.trendmicro.com/en-US/solution/KA-0023430","label":"success.trendmicro.com/en-US/solution/KA-0023430"},{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2026-34926","label":"nvd.nist.gov/vuln/detail/CVE-2026-34926"}],"vendor":"Trend Micro","product":"Apex One","ransomware":false,"ransomwareUse":"Unknown","exploitationType":null}},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-23","name":"Relative Path Traversal","description":"The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as \"..\" that can resolve to a location that is outside of that directory.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/23.html"}],"affected":[{"vendor":"trend micro, inc.","product":"trendai apex one","name":"TrendAI Apex One","label":"trendai apex one","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2019 (14.0), < 14.0.0.17079","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2019 (14.0), < 14.0.0.17079","eol":null,"hubHref":"/vendor/trend_micro_inc/trendai_apex_one"},{"vendor":"trend micro, inc.","product":"trendai apex one as a service","name":"TrendAI Apex One as a Service","label":"trendai apex one as a service","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ SaaS, < 14.0.20731","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ SaaS, < 14.0.20731","eol":null,"hubHref":"/vendor/trend_micro_inc/trendai_apex_one_as_a_service"},{"vendor":"trendmicro","product":"apex_one","name":"apex one","label":"apex_one","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 14.0.0.17079","noFixRecorded":false,"fixedIn":null},{"text":"< 14.0.20731","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 14.0.0.17079 | < 14.0.20731","eol":null,"hubHref":"/vendor/trendmicro/apex_one"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://success.trendmicro.com/en-US/solution/KA-0023430","label":"success.trendmicro.com/en-US/solution/KA-0023430","hostname":"success.trendmicro.com","tags":["Vendor Advisory"]},{"url":"https://success.trendmicro.com/ja-JP/solution/KA-0022974","label":"success.trendmicro.com/ja-JP/solution/KA-0022974","hostname":"success.trendmicro.com","tags":["Vendor Advisory"]},{"url":"https://jvn.jp/en/vu/JVNVU90583059/","label":"jvn.jp/en/vu/JVNVU90583059/","hostname":"jvn.jp","tags":["Third Party Advisory"]},{"url":"https://www.jpcert.or.jp/english/at/2026/at260014.html","label":"www.jpcert.or.jp/english/at/2026/at260014.html","hostname":"www.jpcert.or.jp","tags":["Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34926","label":"www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34926","hostname":"www.cisa.gov","tags":["Government Resource","Third Party Advisory","US Government Resource"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-05-21T13:03:21.164Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"kev-added","date":"2026-05-21T00:00:00.000Z","label":"Added to CISA KEV","detail":"Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability","source":"cisa"},{"kind":"modified","date":"2026-05-22T12:47:07.213Z","label":"Last modified","detail":"Vulnerability information updated.","source":null},{"kind":"kev-due","date":"2026-06-04T00:00:00.000Z","label":"CISA remediation due","detail":"Apply mitigations per vendor instructions.","source":"cisa"}],"risk":{"score":85,"level":"critical","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T19:51:04.228Z","stale":false,"partial":false}}