CVE-2026-73337: Joomla! Core - [20260807] - MFA Authentication Bypass in Joomla 4.0.0-5.4.7 and 6.0.0-6.1.2
Missing state checks can bypass two-factor authentication.
CVE published 2026-08-18 · Record updated 2026-08-19 · Snapshot checked 24 October 2026
Why this matters
Missing state checks can bypass two-factor authentication.
CVSS 4.0: 8.2 (HIGH). Source: CVE assigning authority.
A severity score describes the vulnerability, not the probability that your own website has been compromised. Exposure depends on the installed version, configuration and reachable code path.
When to check your system
Joomla 4.0.0–5.4.7 and 6.0.0–6.1.2.
How to address it
Fixed in 5.4.8 and 6.1.3; include the later September security fixes too.
Record the installed package and vendor build, check the advisory’s prerequisites, back up, apply the vendor fix and test the affected site functions. Distribution packages may include backported fixes without changing the upstream version number.
Sources
This page summarises a selected advisory. It is not evidence that a particular website is vulnerable. Where an advisory covers several CVEs, check the linked record for this CVE’s exact affected range.