CVE-2026-4333 LearnPress <= 4.3.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'skin' Shortcode Attribute
Authenticated attackers can inject arbitrary scripts via the skin shortcode attribute, executing code in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4333?
CVE-2026-4333 is a medium-severity cross-site scripting vulnerability in thimpress LearnPress – WordPress LMS Plugin for Create and Sell Online Courses, published on 8 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The LearnPress – WordPress LMS Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'skin' attribute of the learn_press_courses shortcode in all versions up to and including 4.3.3. This is due to insufficient input sanitization and output escaping on the 'skin' shortcode attribute. The attribute value is used directly in an sprintf() call that generates HTML (class attribute and data-layout attribute) without any esc_attr() escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-4333?
How do I fix CVE-2026-4333?
No fix has been published for CVE-2026-4333 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-4333 being exploited?
There is no known exploitation of CVE-2026-4333 in the wild and no public exploit code.
Sources
Also known as GHSA-7fvw-v44w-rxj9.