CVE-2023-6877 Cross-site scripting in RSS Aggregator by Feedzy – Feed to Post, Autoblogging, News & YouTube Video Feeds Aggregator

Medium 6.4 Published 7 Apr 2024 Updated 8 Apr 2026

Authenticated attackers can inject arbitrary scripts via shortcode error messages, 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-2023-6877?

CVE-2023-6877 is a medium-severity cross-site scripting vulnerability in themeisle RSS Aggregator by Feedzy – Feed to Post, Autoblogging, News & YouTube Video Feeds Aggregator, published on 7 Apr 2024. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The RSS Aggregator by Feedzy – Feed to Post, Autoblogging, News & YouTube Video Feeds Aggregator plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode(s) in all versions up to, and including, 4.3.3 due to insufficient input sanitization and output escaping on the Content-Type field of error messages when retrieving an invalid RSS feed. 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-2023-6877?

It affects 1 product.

Products include Themeisle Rss Aggregator by Feedzy.

How do I fix CVE-2023-6877?

No fix has been published for CVE-2023-6877 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-2023-6877 being exploited?

There is no known exploitation of CVE-2023-6877 in the wild and no public exploit code.

Sources

Also known as GHSA-3xp5-393r-g6q2.