CVE-2026-82842: Unknown SAML Single Sign On

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

The SAML Single Sign On WordPress plugin before 6.0.0 does not honour the configured criterion for linking an incoming single sign-on identity to a WordPress account, always resolving the identity by login name whatever the site has chosen, which allows an attacker who can have the site's identity provider assert a login name of their choosing to authenticate as any account, including an administrator, without proving ownership of that account.

Affected products

• Unknown SAML Single Sign On: from 4.8.43, before 6.0.0 (fixed in 6.0.0)

Published 2026-09-20. Last modified 2026-09-21.