{"id":"CVE-2026-15013","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-15013","generatedAt":"2026-10-28T02:20:02.399Z","title":"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.","description":"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.","published":"2026-07-16T05:16:18.000Z","lastModified":"2026-08-07T06:16:55.000Z","status":"Deferred","sourceIdentifier":"security@wordfence.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-347"],"affected":[],"epss":{"score":0.02446,"percentile":0.84235,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2026-09-01","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":52668,"kind":"exploit","title":"miniOrange  5.4.3 - Unauthenticated Auth Bypass","url":"https://www.exploit-db.com/exploits/52668","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/webapps/52668.py","file":"exploits/multiple/webapps/52668.py","published":"2026-09-01","added":"2026-09-01","updated":"2026-09-01","author":"zer0dayf","type":"webapps","platform":"multiple","port":null,"verified":false,"codes":["CVE-2026-15013"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"A public exploit is published in Exploit-DB and the impact is critical, while EPSS rates exploitation at 2.4%. Anyone can run this; patch or mitigate before the next change window and check exposed instances for signs of use."},"changes":[{"kind":"exploit","label":"Public exploit","at":"2026-09-01T00:00:00.000Z","detail":{"type":"webapps","edbId":52668,"title":"miniOrange  5.4.3 - Unauthenticated Auth Bypass","platform":"multiple","verified":false,"publishedAt":"2026-09-01"},"summary":"Public exploit published in Exploit-DB: miniOrange  5.4.3 - Unauthenticated Auth Bypass (webapps, multiple)."}],"references":[{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/class-mo-saml-login-validate.php#L119","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/class-mo-saml-utilities.php#L416","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/class-mo-saml-utilities.php#L444","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/class-mo-saml-utilities.php#L561","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/includes/lib/SAML2Core/class-mo-saml-xml-security-key.php#L722","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/changeset?reponame=&old=3601345%40miniorange-saml-20-single-sign-on&new=3601345%40miniorange-saml-20-single-sign-on","source":"security@wordfence.com"},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/ee95092d-6351-4612-872d-284165bc1201?source=cve","source":"security@wordfence.com"},{"url":"http://seclists.org/fulldisclosure/2026/Aug/33","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-15013","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}