CVE-2025-4855: Support Board <= 3.8.0 - Unauthenticated Authorization Bypass due to Use of Default Secret Key
Description
The Support Board plugin for WordPress is vulnerable to unauthorized access/modification/deletion of data due to use of hardcoded default secrets in the sb_encryption() function in all versions up to, and including, 3.8.0. This makes it possible for unauthenticated attackers to bypass authorization and execute arbitrary AJAX actions defined in the sb_ajax_execute() function. An attacker can use this vulnerability to exploit CVE-2025-4828 and various other functions unauthenticated.
Classification
CVE ID: CVE-2025-4855
CVSS Base Severity: CRITICAL
CVSS Base Score: 9.8
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Problem Types
CWE-639 Authorization Bypass Through User-Controlled KeyAffected Products
Vendor: Schiocco
Product: Support Board
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.1% (probability of being exploited)
EPSS Percentile: 28.54% (scored less or equal to compared to others)
EPSS Date: 2025-07-16 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-4855https://www.wordfence.com/threat-intel/vulnerabilities/id/afd48bc8-d490-4a3e-97fc-70cf008cbf66?source=cve
https://codecanyon.net/item/support-board-help-desk-and-chat/20359943