CVE-2026-93756

Smash Balloon Social Post Feed <= 4.13.0 - Unauthenticated Stored Cross-Site Scripting via Facebook Comment Message in Admin Builder Preview

2026-10-01 18:58
Yuto Hyakumoto

Strategic Overview

Status
Patched in 4.14.0
Affected Plugin
Smash Balloon Social Post Feed – Simple Social Feeds for WordPress
Affected Version
<= 4.13.0
CVSS
7.2High
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2026-93756
View all Smash Balloon Social Post Feed – Simple Social Feeds for WordPress vulnerabilities

At a glance

CVE-2026-93756 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Smash Balloon Social Post Feed WordPress plugin, affecting versions <= 4.13.0. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 4.14.0; sites on affected versions should update now. Disclosed October 2026, reported by Yuto Hyakumoto.

Vulnerability Overview

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 cff_install_addon 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.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Smash Balloon Social Post Feed <= 4.13.0 takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Smash Balloon Social Post Feed the fix is 4.14.0: builds <= 4.13.0 are affected, anything from 4.14.0 onward is not.

Remediation

Update to version 4.14.0, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Smash Balloon Social Post Feed 4.14.0 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-93756https://www.wordfence.com/threat-intel/vulnerabilities/id/a4a3bc4b-bc0c-47ac-9f60-e05b300311b4https://nvd.nist.gov/vuln/detail/CVE-2026-93756

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C