CVE-2015-8977: Mybb Merge System

High severity, CVSS 7.5. EPSS: 2.2% chance of exploitation in the next 30 days.

MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.8.6 allow remote attackers to obtain the installation path via vectors involving error log files.

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.