CVE-2020-12676: Fusionauth SAMLV2

Critical severity, CVSS 9.1. EPSS: 2.9% chance of exploitation in the next 30 days.

FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, aka a "Signature exclusion attack".

Affected products

• Fusionauth SAMLV2: version 0.2.3 only

Published 2020-10-02. Last modified 2026-06-17.