CVE-2026-15981

EIP tracks 1 public exploit for CVE-2026-15981. PoCs published by Nxploited.

AI-analyzed exploit summary This exploit targets CVE-2026-15981, an authentication bypass vulnerability in the miniOrange SAML 2.0 Single Sign On WordPress plugin (versions ≤ 5.4.4). The PoC abuses a loose boolean check in `openssl_verify()` where a return value of -1 (OpenSSL error) is incorrectly treated as a successful signature verification, allowing unauthenticated attackers to log in as any WordPress user, including administrators, via a crafted SAMLResponse.

The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 5.4.4. This is due to the mo_saml_validate_signature() function performing a loose boolean check on the raw tri-state integer returned by PHP's openssl_verify(), causing an error return value of -1 to be evaluated as truthy and therefore treated as a successful signature verification. This makes it possible for unauthenticated attackers to log in as any existing WordPress user, including administrators, by submitting a crafted SAMLResponse containing an attacker-controlled NameID and a deliberately malformed signature value that triggers an OpenSSL processing error — bypassing verification entirely and resulting in wp_set_auth_cookie() being called for the targeted account.