CVE-2025-4577: Smash Balloon Custom Facebook Feed <= 4.3.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via `data-color` Attribute
Description
The Smash Balloon Social Post Feed – Simple Social Feeds for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the data-color attribute in all versions up to, and including, 4.3.1 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.
Classification
CVE ID: CVE-2025-4577
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.4
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Problem Types
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Affected Products
Vendor: smub
Product: Smash Balloon Social Post Feed – Simple Social Feeds for WordPress
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.03% (probability of being exploited)
EPSS Percentile: 7.56% (scored less or equal to compared to others)
EPSS Date: 2025-06-20 (when was this score calculated)
Stakeholder-Specific Vulnerability Categorization (SSVC)
SSVC Exploitation: none
SSVC Technical Impact: partial
SSVC Automatable: false
References
https://nvd.nist.gov/vuln/detail/CVE-2025-4577https://www.wordfence.com/threat-intel/vulnerabilities/id/ec3de7e2-4a29-401f-af2c-0ce78d768eae?source=cve
https://plugins.trac.wordpress.org/browser/custom-facebook-feed/tags/4.3.0/assets/js/cff-scripts.js#L245
https://plugins.trac.wordpress.org/browser/custom-facebook-feed/tags/4.3.0/assets/js/cff-scripts.js#L254