{"schemaVersion":3,"id":"CVE-2026-81340","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"The MasterStudy LMS WordPress Plugin  WordPress plugin before 3.7.50 does not perform per-object ownership or capability checks when updating orders through its REST API, allowing users with the Instructor role to modify any order on the site, granting free course enrolment, revoking other users' paid enrolments, and tampering with order notes.","dates":{"published":"2026-09-18T06:00:11.903Z","modified":"2026-09-18T11:13:38.917Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"wordfence","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":3.8,"severity":"low","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":3.8,"severity":"low","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"wordfence","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00318,"percentile":0.2318,"severity":"low","asOf":"2026-10-18T00:00:00.000Z","change":{"pp":0.17600000000000002,"baselineDate":"2026-09-18T00:00:00.000Z","baselineScore":0.00142},"history":[{"date":"2026-09-18T00:00:00.000Z","score":0.00142,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00231,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00231,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00231,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00231,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00231,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00318,"percentile":0.2318}],"last30":[{"date":"2026-09-18T00:00:00.000Z","score":0.00142,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00231,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00231,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00231,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00231,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00231,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00318,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00318,"percentile":0.2318}]},"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":[{"id":"REF_BC617954E346A509","name":"Exploit Reference (wpscan.com)","source":"reference","url":"https://wpscan.com/vulnerability/8006876f-27bb-483d-b4e4-9fa4414d16f0/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key","description":"The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/639.html"}],"affected":[{"vendor":"unknown","product":"masterstudy lms wordpress plugin","name":"MasterStudy LMS WordPress Plugin","label":"masterstudy lms wordpress plugin","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 3.7.50","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.7.50","eol":null,"hubHref":"/vendor/unknown/masterstudy_lms_wordpress_plugin"},{"vendor":"wordpress","product":"masterstudy-lms-learning-management-system","name":"MasterStudy LMS WordPress Plugin – for Online Courses and Education","label":"masterstudy-lms-learning-management-system","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 3.7.49 (fixed in 3.7.50)","noFixRecorded":false,"fixedIn":"3.7.50"}],"versionsText":"≤ 3.7.49 (fixed in 3.7.50)","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://wpscan.com/vulnerability/8006876f-27bb-483d-b4e4-9fa4414d16f0/","label":"wpscan.com/vulnerability/8006876f-27bb-483d-b4e4-9fa4414d16f0/","hostname":"wpscan.com","tags":["Exploit","VDB Entry","Technical Description"]},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/7d5a921c-992f-43d6-9083-9ac75637f66c","label":"www.wordfence.com/threat-intel/vulnerabilities/id/7d5a921c-992f-43d6-9083-9ac75637f66c","hostname":"www.wordfence.com","tags":["Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-18T06:00:11.903Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-18T11:13:38.917Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":27,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T07:22:17.876Z","stale":false,"partial":false}}