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CVE-2023-6486 Spectra – WordPress Gutenberg Blocks <= 2.10.3 - Authenticated(Contributor+) Cross-Site Scripting via Custom CSS

Medium 6.4 Published Updated

Authenticated contributors can inject arbitrary scripts via Custom CSS, 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-2023-6486?

CVE-2023-6486 is a medium-severity cross-site scripting vulnerability in brainstormforce Spectra Gutenberg Blocks – Website Builder for the Block Editor, published on 9 Apr 2024. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The Spectra – WordPress Gutenberg Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Custom CSS metabox in all versions up to and including 2.10.3 due to insufficient input sanitization and output 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-2023-6486?

It affects 1 product.

Products include Brainstormforce Spectra.

How do I fix CVE-2023-6486?

No fix has been published for CVE-2023-6486 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-2023-6486 being exploited?

There is no known exploitation of CVE-2023-6486 in the wild and no public exploit code.

Sources

Also known as GHSA-g47h-q6pp-ww7f.

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