CVE-2024-3565 Cross-site scripting in Content Blocks (Custom Post Widget)

Medium 6.4 Published 1 Jun 2024 Updated 8 Apr 2026

Authenticated attackers can inject arbitrary scripts via the content_block shortcode, 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-2024-3565?

CVE-2024-3565 is a medium-severity cross-site scripting vulnerability in vanderwijk Content Blocks (Custom Post Widget), published on 1 Jun 2024. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The Content Blocks (Custom Post Widget) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'content_block' shortcode in all versions up to, and including, 3.3.0 due to insufficient input sanitization and output escaping on user supplied attributes. 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-2024-3565?

It affects 1 product.

Products include Vanderwijk Content Blocks.

How do I fix CVE-2024-3565?

No fix has been published for CVE-2024-3565 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-2024-3565 being exploited?

There is no known exploitation of CVE-2024-3565 in the wild and no public exploit code.

Sources

Also known as GHSA-9rvv-q72h-c5xp.