CVE-2021-27948: Mybb

High severity, CVSS 7.2. EPSS: 1% chance of exploitation in the next 30 days.

SQL Injection vulnerability in MyBB before 1.8.26 via User Groups. (issue 3 of 3).

Affected products

• Mybb Mybb: before 1.8.26 (fixed in 1.8.26)

Published 2021-03-15. Last modified 2026-06-17.