CVE-2026-104736: Insecure Deserialization Flaw in thimpress LearnPress – WordPress LMS Plugin for Create and S Scores 9.8 on CVSS
A newly published critical vulnerability in thimpress LearnPress – WordPress LMS Plugin for Create and S carries a CVSS score of 9.8. Here is what is affected and how to respond.
Key points
- CVE-2026-104736 affects thimpress LearnPress – WordPress LMS Plugin for Create and S.
- CVSS 9.8 (Critical).
- No exploitation confirmed yet.
A critical insecure deserialization tracked as CVE-2026-104736 has been published in the National Vulnerability Database for thimpress LearnPress – WordPress LMS Plugin for Create and S, with a CVSS base score of 9.8.
At a glance
- CVE
- CVE-2026-104736
- Product
- thimpress LearnPress – WordPress LMS Plugin for Create and S
- CVSS
- 9.8 Critical
- Weakness
- insecure deserialization
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: 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.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Thimpress | LearnPress – WordPress LMS Plugin for Create and Sell Online Courses | up to 4.4.10 |
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
Background: Insecure deserialization
Look for base64-encoded parameters, unexpected object instantiation, or state changes that bypass authentication. Inspect input handling for unvalidated deserialization. Use allowlists for expected data types and verify integrity with digital signatures to prevent arbitrary code execution.
Read the full guide: Warning Signs of Insecure Deserialization in Web Applications
What to do and how to stay safe: CVE-2026-104736
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-104736?
CVE-2026-104736 is a insecure deserialization vulnerability in thimpress LearnPress – WordPress LMS Plugin for Create and S.
How severe is CVE-2026-104736?
It has a CVSS score of 9.8 Critical.
Is CVE-2026-104736 being exploited?
There is no public confirmation of exploitation at the time of publication.
