# CVE-2026-78175

## Summary

- **CVE ID:** CVE-2026-78175
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-502
- **Published:** Sep 12, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- themeum — Tutor LMS – eLearning and online course solution (0)

## References

- [CNA](https://www.wordfence.com/threat-intel/vulnerabilities/id/d0077d56-11e7-4e74-abe0-63e81db67be3?source=cve)
- [CNA](https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L213)
- [CNA](https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L217)
- [CNA](https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L204)
- [CNA](https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/Withdraw.php#L44)
- [CNA](https://plugins.trac.wordpress.org/browser/tutor/tags/4.0.7/classes/RestAPI.php#L190)
- [CNA](https://plugins.trac.wordpress.org/changeset?reponame=&old=3690454%40tutor&new=3690454%40tutor)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.59%
- **EPSS Percentile:** 46.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._