CVE-2015-8974: Mybb Merge System

Critical severity, CVSS 10.0. EPSS: 2.1% chance of exploitation in the next 30 days.

SQL injection vulnerability in the Group Promotions module in the admin control panel in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.8.6 allows remote attackers to execute arbitrary SQL commands via unspecified vectors.

Affected products

• Mybb Merge System: up to and including 1.8.5
• Mybb Mybb: up to and including 1.6.17; version 1.8.0 only; version 1.8.1 only; version 1.8.2 only; version 1.8.3 only; version 1.8.4 only; …

Published 2017-01-31. Last modified 2026-06-17.