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CVE-2024-5439 Blocksy <= 2.0.50 - Authenticated (Contributor+) Stored Cross-Site Scripting

Medium 6.4 Published Updated

Attackers can inject arbitrary scripts via the custom_url parameter, allowing script execution in victim browsers through social engineering.

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-2024-5439?

CVE-2024-5439 is a medium-severity cross-site scripting vulnerability in creativethemeshq Blocksy, published on 5 Jun 2024. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The Blocksy theme for WordPress is vulnerable to Reflected Cross-Site Scripting via the custom_url parameter in all versions up to, and including, 2.0.50 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Weakness: CWE-79, CWE-20

Which versions are affected by CVE-2024-5439?

It affects 1 product.

Products include Creativethemes Blocksy.

How do I fix CVE-2024-5439?

No fix has been published for CVE-2024-5439 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-2024-5439 being exploited?

There is no known exploitation of CVE-2024-5439 in the wild and no public exploit code.

Sources

Also known as GHSA-8m9g-pfr8-r84c.

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