{"schemaVersion":3,"id":"CVE-2026-15013","aliases":[],"status":"published","duplicateOf":null,"title":"SAML Single Sign On <= 5.4.3 - Unauthenticated Authentication Bypass via 'SAMLResponse' Parameter Signature Algorithm Confusion","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.","dates":{"published":"2026-07-16T03:44:32.129Z","modified":"2026-08-07T05:32:21.870Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"wordfence","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","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01504,"percentile":0.74137,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.01504},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.01504,"percentile":0.74137}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01504,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.01504,"percentile":0.74137}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"52668","name":"miniOrange  5.4.3 - Unauthenticated Auth Bypass","source":"exploit-database","url":"https://www.exploit-db.com/exploits/52668","maturity":"poc","reliabilityScore":0.5,"verified":false,"type":null,"platforms":["multiple"],"requiresAuth":null,"exploitdb":{"verified":false,"type":"webapps","platform":"multiple","file":"exploits/multiple/webapps/52668.py","codes":["CVE-2026-15013"]},"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature","description":"The product does not verify, or incorrectly verifies, the cryptographic signature for data.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/347.html"}],"affected":[{"vendor":"cyberlord92","product":"saml single sign on – sso login","name":"SAML Single Sign On – SSO Login","label":"saml single sign on – sso login","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 5.4.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 5.4.3","eol":null,"hubHref":"/vendor/cyberlord92/saml_single_sign_on_-_sso_login"},{"vendor":"wordpress","product":"miniorange-saml-20-single-sign-on","name":"SAML Single Sign On – SSO Login","label":"miniorange-saml-20-single-sign-on","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 5.4.3 (fixed in 5.4.4)","noFixRecorded":false,"fixedIn":"5.4.4"}],"versionsText":"≤ 5.4.3 (fixed in 5.4.4)","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/ee95092d-6351-4612-872d-284165bc1201?source=cve","label":"www.wordfence.com/threat-intel/vulnerabilities/id/ee95092d-6351-4612-872d-284165bc1201?source=cve","hostname":"www.wordfence.com","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/class-mo-saml-utilities.php#L444","label":"plugins.trac.wordpress.org/browser/…","hostname":"plugins.trac.wordpress.org","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/class-mo-saml-utilities.php#L416","label":"plugins.trac.wordpress.org/browser/…","hostname":"plugins.trac.wordpress.org","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/class-mo-saml-utilities.php#L561","label":"plugins.trac.wordpress.org/browser/…","hostname":"plugins.trac.wordpress.org","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/class-mo-saml-login-validate.php#L119","label":"plugins.trac.wordpress.org/browser/…","hostname":"plugins.trac.wordpress.org","tags":[]},{"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","label":"plugins.trac.wordpress.org/browser/…","hostname":"plugins.trac.wordpress.org","tags":[]},{"url":"https://plugins.trac.wordpress.org/changeset?reponame=&old=3601345%40miniorange-saml-20-single-sign-on&new=3601345%40miniorange-saml-20-single-sign-on","label":"plugins.trac.wordpress.org/changeset","hostname":"plugins.trac.wordpress.org","tags":[]},{"url":"http://seclists.org/fulldisclosure/2026/Aug/33","label":"seclists.org/fulldisclosure/2026/Aug/33","hostname":"seclists.org","tags":[]},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/ee95092d-6351-4612-872d-284165bc1201","label":"www.wordfence.com/threat-intel/vulnerabilities/id/ee95092d-6351-4612-872d-284165bc1201","hostname":"www.wordfence.com","tags":["Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-07-16T03:44:32.129Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-07T05:32:21.870Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T21:38:59.653Z","stale":false,"partial":false}}