CVE-2026-71573: Joomla!

High severity, CVSS 8.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.

Affected products

• Joomla! Joomla!: from 4.0.0, before 5.4.8 (fixed in 5.4.8); from 6.0.0, before 6.1.3 (fixed in 6.1.3)

Published 2026-08-18. Last modified 2026-09-03.