CVE-2026-104736

9.8Critical

Published 17 Oct 2026 · NVD status: Received · AI triage by gemini-3.8-flash

9.8Critical

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-502

Impact

Unauthenticated remote attackers can execute arbitrary code or trigger unauthorized actions via PHP Object Injection. They only need network access to send a crafted checkout AJAX request.

Root cause

The checkout AJAX handler sanitizes the 'checkout-email' parameter with sanitize_text_field(), allowing serialized strings into the session table where they are subsequently deserialized with unrestricted unserialize().

Affected systems

LearnPress WordPress plugin up to and including version 4.4.10

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Upgrade the LearnPress plugin to a version newer than 4.4.10. If an immediate update is not possible, deactivate the LearnPress plugin or block unauthenticated requests targeting LearnPress checkout AJAX actions at the WAF.

shell

$ wp plugin update learnpress

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

The LearnPress plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.4.10 via deserialization of untrusted input from the 'checkout-email' request parameter during the checkout AJAX action. The value is passed through sanitize_text_field(), which does not strip serialized object syntax, then stored in the LearnPress session table and later fed to LP_Helper::maybe_unserialize() → unserialize() (without an allowed_classes restriction) by LP_Session_Handler::get() on subsequent requests. This makes it possible for unauthenticated attackers to inject a PHP Object.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-104736