{"schemaVersion":3,"id":"CVE-2026-26134","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Integer overflow or wraparound in Microsoft Office allows an authorized attacker to elevate privileges locally.","dates":{"published":"2026-03-10T17:05:10.187Z","modified":"2026-06-19T18:17:52.661Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00346,"percentile":0.26885,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":-0.007000000000000018,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00353},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00346,"percentile":0.26885}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00353,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00333,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00346,"percentile":0.26885}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":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-190","name":"Integer Overflow or Wraparound","description":"The product performs a calculation that can\n         produce an integer overflow or wraparound when the logic\n         assumes that the resulting value will always be larger than\n         the original value. This occurs when an integer value is\n         incremented to a value that is too large to store in the\n         associated representation. When this occurs, the value may\n         become a very small or negative number.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/190.html"},{"id":"CWE-416","name":"Use After Free","description":"The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html"}],"affected":[{"vendor":"microsoft","product":"365_copilot","name":"365 copilot","label":"365_copilot","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 16.0.19822.20000","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 16.0.19822.20000","eol":null,"hubHref":"/vendor/microsoft/365_copilot"},{"vendor":"microsoft","product":"microsoft office for android","name":"Microsoft Office for Android","label":"microsoft office for android","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 16.0.1, < 16.0.19822.20000","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 16.0.1, < 16.0.19822.20000","eol":null,"hubHref":"/vendor/microsoft/microsoft_office_for_android"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26134","label":"msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26134","hostname":"msrc.microsoft.com","tags":["Vendor Advisory","Patch"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-03-10T17:05:10.187Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-19T18:17:52.661Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":31,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T14:29:55.218Z","stale":false,"partial":false}}