CVE-2021-23127: Joomla!

Critical severity, CVSS 9.1. EPSS: 1.4% chance of exploitation in the next 30 days.

An issue was discovered in Joomla! 3.2.0 through 3.9.24. Usage of an insufficient length for the 2FA secret accoring to RFC 4226 of 10 bytes vs 20 bytes.

Affected products

• Joomla! Joomla!: from 3.2.0, before 3.9.25 (fixed in 3.9.25)

Published 2021-03-04. Last modified 2026-06-17.