cyberlord92 SAML Single Sign On Plugin up to 5.4.6 on WordPress SAML SSO Login mo_saml_login_validate improper authentication

Summaryinfo

A vulnerability was found in cyberlord92 SAML Single Sign On Plugin up to 5.4.6. It has been classified as critical. This vulnerability affects the function mo_saml_login_validate of the component SAML SSO Login. Performing a manipulation results in improper authentication. This vulnerability is cataloged as CVE-2026-75807. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in cyberlord92 SAML Single Sign On Plugin up to 5.4.6. It has been classified as critical. This affects the function mo_saml_login_validate of the component SAML SSO Login. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in versions up to, and including, 5.4.6. This is due to the mo_saml_login_validate() ACS handler persisting the X.509 certificate extracted from an incoming SAMLResponse into the mo_saml_required_certificate option before the signature-validation verdict is enforced, because mo_saml_find_certificate() returns false on a fingerprint mismatch rather than halting execution. This makes it possible for unauthenticated attackers to overwrite the plugin's stored IdP signing certificate with an attacker-controlled value, and subsequently forge SAML assertions for any WordPress account — including administrators — to obtain a fully privileged session. Note: The exploit requires the administrator to perform a repair after receiving the test_config_error_wpsamlerr004 error message during the test configuration.

It is possible to read the advisory at wordfence.com. This vulnerability is uniquely identified as CVE-2026-75807 since 08/18/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/29/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• cyberlord92

Name

• SAML Single Sign On Plugin

Version

• 5.4.0
• 5.4.1
• 5.4.2
• 5.4.3
• 5.4.4
• 5.4.5
• 5.4.6

CPE 2.3info

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CPE 2.2info

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