{"id":"CVE-2026-78175","state":"PUBLISHED","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.","publishedAt":"2026-09-12T07:39:15.920Z","updatedAt":"2026-09-15T14:01:12.024Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Wordfence"},"assigner":"Wordfence","products":["themeum Tutor LMS – eLearning and online course solution"],"affected":[{"vendor":"themeum","product":"Tutor LMS – eLearning and online course solution","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"4.0.7","versionType":"semver"}]}],"references":["https://www.wordfence.com/threat-intel/vulnerabilities/id/d0077d56-11e7-4e74-abe0-63e81db67be3?source=cve","https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L213","https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L217","https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L204","https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L44","https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/RestAPI.php#L190","https://plugins.trac.wordpress.org/changeset?reponame=&old=3690454%40tutor&new=3690454%40tutor"],"weaknesses":["CWE-502"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/78xxx/CVE-2026-78175.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-78175","state":"PUBLISHED","datePublished":"2026-09-12T07:39:15.920Z","dateUpdated":"2026-09-15T14:01:12.024Z","assignerShortName":"Wordfence","assignerOrgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","dateReserved":"2026-08-23T15:39:15.798Z"},"containers":{"cna":{"title":"Tutor LMS <= 4.0.7 - Authenticated (Subscriber+) PHP Object Injection to Remote Code Execution","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"themeum","product":"Tutor LMS – eLearning and online course solution","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"4.0.7","versionType":"semver"}]}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/d0077d56-11e7-4e74-abe0-63e81db67be3?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L213"},{"url":"https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L217"},{"url":"https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L204"},{"url":"https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L44"},{"url":"https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/RestAPI.php#L190"},{"url":"https://plugins.trac.wordpress.org/changeset?reponame=&old=3690454%40tutor&new=3690454%40tutor"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-502","lang":"en","description":"CWE-502 Deserialization of Untrusted Data","type":"CWE"}]}],"providerMetadata":{"shortName":"Wordfence","orgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","dateUpdated":"2026-09-12T07:39:15.920Z"},"credits":[{"lang":"en","type":"finder","value":"Chloe Chamberland"},{"lang":"en","type":"finder","value":"Wordfence Argus"}],"timeline":[{"time":"2026-08-23T15:54:24.000Z","lang":"en","value":"Vendor Notified"},{"time":"2026-09-11T18:49:43.000Z","lang":"en","value":"Disclosed"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-15T13:26:20.914058Z","id":"CVE-2026-78175","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-15T14:01:12.024Z"}}]}}}