CVE-2026-93756: Smash Balloon Social Post Feed <= 4.13.0 - Unauthenticated Stored Cross-Site Scripting via Facebook Comment Message in Admin Builder Preview
The Smash Balloon Social Post Feed – Simple Social Feeds for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Facebook Comment Message via v-html in Admin Builder Preview in all versions up to, and including, 4.13.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that will execute whenever an administrator accesses the feed builder preview page. This attack requires only a Facebook account to post a comment on the connected Facebook Page, with no WordPress credentials needed; additionally, the use of v-show rather than v-if means injected HTML — including onerror handlers — is evaluated in the DOM even when the comment section is not visually displayed. When combined with the lack of URL validation in the cffinstalladdon AJAX handler (admin/addon-functions.php), an injected script running in an administrator's session can trigger arbitrary plugin installation from an attacker-controlled URL, which may result in server-side code execution.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue, and what access do they need?
An attacker needs only a Facebook account that can post a comment on the Facebook Page connected to the plugin's feed. They do not need WordPress credentials or prior access to the WordPress site.
When does the injected script execute?
The script executes when an administrator opens the feed builder preview page. Injected HTML can be evaluated even if the comment section is not visibly displayed, because the preview uses v-show rather than v-if.
Which installations are affected?
All versions up to and including 4.13.0 are affected. The vulnerable behavior is in the plugin's admin builder preview handling of Facebook comment messages.
What could an attacker do after their script runs in an administrator's browser?
The script can act in the administrator's session and invoke the cff_install_addon AJAX handler with an attacker-controlled URL. This can cause arbitrary plugin installation and may lead to server-side code execution.