Saml Single Sign On CVEs and Security Vulnerabilities

CVE-2026-19842

SAML Single Sign On 4.8.85 - 5.4.6 - Unauthenticated Administrator Account Takeover via SAML Trust Anchor Overwrite

The SAML Single Sign On WordPress plugin before 5.4.7 does not verify the signature of a SAML response before storing the certificate it carries, and offers an administrator a one-click control that promotes that stored certificate to the site's trusted signing certificate, allowing unauthenticated attackers to have a certificate of their own trusted and then authenticate as any user, including an administrator.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

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Saml Single Sign On

CVE-2026-82842

SAML Single Sign On < 6.0.0 - Unauthenticated Privilege Escalation via Account Matching

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.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed