CVE Watch16 jul 2026

CVE-2026-15013

The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass via SAML Signature Algorithm Confusion in al

CVSS

9.8

Crítico

EPSS

0.4%

p34

KEV

—

Exploit Today

0-100

Publicado: 16 jul 2026 · Última mod.: 16 jul 2026 · CWE-347

EPSS · 30d

0.3%EPSS · 30 días0.4%

2026-07-162026-07-21

Descripción técnica

The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass via SAML Signature Algorithm Confusion in all versions up to, and including, 5.4.3. The vulnerability exists because `Mo_SAML_Utilities::mo_saml_cast_key()` reads the `SignatureMethod` Algorithm attribute directly from the attacker-controlled `SAMLResponse` parameter rather than enforcing the locally configured algorithm, causing the plugin to recast the IdP's RSA public key as an HMAC-SHA1 shared secret and validate the forged signature against it. This makes it possible for unauthenticated attackers to forge a SAML assertion targeting any WordPress account — including administrators — obtain valid WordPress authentication cookies, and achieve full administrator-level account takeover.

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