Risk Letters

Exploited vulnerability

CVE-2026-104736

TLP:CLEAR

thimpress learnpress Deserialization of Untrusted Data

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:

Facts

  • Vendor: thimpress
  • Product: learnpress
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 2.5 %
  • First known exploitation: 16 October 2026
  • First seen by Risk Letters: 17 October 2026

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Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD