# CVE-2026-104736: LearnPress <= 4.4.10 - Unauthenticated PHP Object Injection via 'checkout-email' Parameter

> Unauthenticated attackers can achieve code execution via PHP object injection in the LearnPress WordPress plugin through the checkout-email parameter.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Oct 2026
- **Updated:** 18 Oct 2026
- **Also known as:** GHSA-xchc-mccm-x286

## What is CVE-2026-104736?

CVE-2026-104736 is a critical unsafe deserialization vulnerability in thimpress LearnPress – WordPress LMS Plugin for Create and Sell Online Courses, published on 17 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2026-104736?


## How do I fix CVE-2026-104736?

No fix has been published for CVE-2026-104736 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104736 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104736 exists.

Public exploit code:

- PoC for CVE-2026-104736 — LearnPress ≤4.4.10 unauthenticated PHP object injection via checkout-email (lp-ajax=checkout). Check + exploit. Authorized testing only. (github_poc): https://github.com/murrez/CVE-2026-104736
- LearnPress <= 4.4.9.1 - PHP Object Injection (nuclei): http/cves/2026/CVE-2026-104736.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104736 and fix it if it is affected.

What it is: CVE-2026-104736 is a critical unsafe deserialization vulnerability in thimpress LearnPress – WordPress LMS Plugin for Create and Sell Online Courses, published on 17 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104736 exists.

Affected product: thimpress LearnPress – WordPress LMS Plugin for Create and Sell Online Courses. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-104736/ (Markdown: https://insights.sbomify.com/CVE-2026-104736/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104736
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104736
- OSV: https://osv.dev/vulnerability/CVE-2026-104736

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104736/
Summaries are generated and may contain mistakes; the official description above is the record.