{"schemaVersion":3,"id":"CVE-2026-78175","aliases":[],"status":"published","duplicateOf":null,"title":"Tutor LMS <= 4.0.7 - Authenticated (Subscriber+) PHP Object Injection to Remote Code Execution","description":"The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 4.0.7 via the `withdraw_method_field` parameter of the `tutor_save_withdraw_account` AJAX handler. This is due to the handler lacking any capability or role check, relying solely on a nonce, while also passing attacker-supplied values through `esc_sql()`, which replaces every `%` character with a 66-byte HMAC placeholder token before the data is serialized and stored via `update_user_meta()`; when the meta is later retrieved, the placeholder is collapsed back to a single `%`, leaving serialized string length declarations 65 bytes greater than the actual content, and because array keys originate from entirely unescaped POST field names, `unserialize()` over-reads into attacker-controlled bytes, allowing injection of an arbitrary serialized object stream. This makes it possible for authenticated attackers, with subscriber-level access and above, to achieve remote code execution on the server by triggering the `GuzzleHttp\\Cookie\\FileCookieJar` POP chain, reachable via the `spl_autoload_register` loader in `TUTOR\\RestAPI` which loads the plugin's own bundled PayPal Composer autoloader, writing attacker-controlled content to an attacker-specified filename. This has an unauthenticated pathway when user registration is enabled, which is common for students and teachers to register, and it requires the monetization feature to be enabled.","dates":{"published":"2026-09-12T07:39:15.920Z","modified":"2026-09-15T14:01:12.024Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"wordfence","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01073,"percentile":0.64625,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0.48700000000000004,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00586},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.01073,"percentile":0.64625}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00586,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01073,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","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