CVE-2024-3343 Cross-site scripting in Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE

Medium 6.4 Published 11 Apr 2024 Updated 8 Apr 2026

Authenticated contributors can inject arbitrary scripts via block attributes, leading to stored XSS execution for other users.

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-2024-3343?

CVE-2024-3343 is a medium-severity cross-site scripting vulnerability in themeisle Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE, published on 11 Apr 2024. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's block attributes in all versions up to, and including, 2.6.8 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-2024-3343?

It affects 1 product.

Products include Themeisle Otter Blocks.

How do I fix CVE-2024-3343?

No fix has been published for CVE-2024-3343 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-2024-3343 being exploited?

There is no known exploitation of CVE-2024-3343 in the wild and no public exploit code.

Sources

Also known as GHSA-rwc7-c97h-vxjm.