CVE-2023-4779 Cross-site scripting in User Submitted Posts – Enable Users to Submit Posts from the Front End

Medium 6.4 Published 6 Sep 2023 Updated 8 Apr 2026

Authenticated contributors can inject arbitrary scripts via shortcode attributes, leading to stored XSS execution on victim pages.

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-2023-4779?

CVE-2023-4779 is a medium-severity cross-site scripting vulnerability in specialk User Submitted Posts – Enable Users to Submit Posts from the Front End, published on 6 Sep 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The User Submitted Posts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's [usp_gallery] shortcode in versions up to, and including, 20230811 due to insufficient input sanitization and output escaping on user supplied attributes like 'before'. This makes it possible for authenticated attackers with contributor-level and above permissions 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-2023-4779?

It affects 1 product.

Products include Plugin-Planet User Submitted Posts.

How do I fix CVE-2023-4779?

No fix has been published for CVE-2023-4779 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-2023-4779 being exploited?

There is no known exploitation of CVE-2023-4779 in the wild and no public exploit code.

Sources

Also known as GHSA-3c82-f6j3-5x2g.