{"id":"CVE-2026-75807","aliases":["EUVD-2026-68133","GHSA-2pfc-9h54-m36f"],"status":"published","title":"SAML Single Sign On \u003c= 5.4.6 - Unauthenticated Authentication Bypass via X.509 Certificate Poisoning","description":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0041,"percentile":0.35501,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2026-08-29T17:25:48Z","modified":"2026-08-31T20:14:36Z","products":[{"vendor":"cyberlord92","product":"saml single sign on – sso login"}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/9baea072-2c07-40b6-8410-2ebe752b0874?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.6/class-mo-saml-login-validate.php#L236"},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.6/class-mo-saml-login-validate.php#L292"},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.6/class-mo-saml-utilities.php#L739"},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.6/mo-saml-settings-page.php#L141"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75807"},{"url":"https://github.com/advisories/GHSA-2pfc-9h54-m36f"}],"sources":{"cve":[{"id":"CVE-2026-75807","title":"SAML Single Sign On \u003c= 5.4.6 - Unauthenticated Authentication Bypass via X.509 Certificate Poisoning","description":"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.","status":"published","published":"2026-08-29T17:25:48.408Z","modified":"2026-08-31T18:10:18.791Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:20:07.260654Z"}],"euvd":[{"id":"EUVD-2026-68133","description":"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.","status":"published","published":"2026-08-29T17:25:48Z","modified":"2026-08-31T18:10:18Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T18:01:20.215322Z"}],"ghsa":[{"id":"GHSA-2pfc-9h54-m36f","title":"The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass...","description":"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.","status":"published","published":"2026-08-29T18:31:32Z","modified":"2026-08-29T18:31:38Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T15:11:10.168906Z"}],"nvd":[{"id":"CVE-2026-75807","description":"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.","status":"published","published":"2026-08-29T18:16:36.313Z","modified":"2026-08-31T20:14:36.25Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:12:42.691315Z"}]}}