{"id":"CVE-2025-48951","aliases":["EUVD-2025-16787","GHSA-v9m8-9xxp-q492"],"status":"published","title":"Auth0-PHP SDK Deserialization of Untrusted Data vulnerability","description":"Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. Versions 8.0.0-BETA3 prior to 8.3.1 contain a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data. Applications using the Auth0-PHP SDK are affected, as are applications using the Auth0/symfony, Auth0/laravel-auth0, or Auth0/wordpress SDKs, because those SDKsrely on the Auth0-PHP SDK versions from 8.0.0-BETA3 until 8.14.0. Version 8.3.1 contains a patch for the issue.","severity":{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0075,"percentile":0.55415,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-502"],"published":"2025-06-03T20:52:35Z","modified":"2026-10-28T02:30:50Z","fixes":[{"ecosystem":"Packagist","package":"auth0/auth0-php","fixed_in":["8.3.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"auth0/auth0-php","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0-BETA3"},{"fixed":"8.3.1"}]}]},{"source":"osv","ecosystem":"Packagist","package":"auth0/auth0-php","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0-BETA3"},{"fixed":"8.3.1"}]}],"versions":["8.0.0","8.0.0-BETA3","8.0.1","8.0.2","8.0.3","8.0.4","8.0.5","8.0.6","8.1.0","8.2.0","8.2.1","8.3.0"]}],"products":[{"vendor":"auth0","product":"auth0-php"}],"references":[{"url":"https://github.com/auth0/auth0-PHP/security/advisories/GHSA-v9m8-9xxp-q492","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/auth0/laravel-auth0/security/advisories/GHSA-c42h-56wx-h85q","tags":["x_refsource_MISC","advisory","web"]},{"url":"https://github.com/auth0/symfony/security/advisories/GHSA-98j6-67v3-mw34","tags":["x_refsource_MISC","advisory","web"]},{"url":"https://github.com/auth0/wordpress/security/advisories/GHSA-862m-5253-832r","tags":["x_refsource_MISC","advisory","web"]},{"url":"https://github.com/auth0/auth0-PHP/commit/04b1f5daa8bdfebc5e740ec5ca0fb2df1648a715","tags":["x_refsource_MISC","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48951","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-v9m8-9xxp-q492"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48951.json","tags":["advisory"]},{"url":"https://github.com/auth0/auth0-PHP","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-48951","title":"Auth0-PHP SDK Deserialization of Untrusted Data vulnerability","description":"Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. Versions 8.0.0-BETA3 prior to 8.3.1 contain a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data. Applications using the Auth0-PHP SDK are affected, as are applications using the Auth0/symfony, Auth0/laravel-auth0, or Auth0/wordpress SDKs, because those SDKsrely on the Auth0-PHP SDK versions from 8.0.0-BETA3 until 8.14.0. Version 8.3.1 contains a patch for the issue.","status":"published","published":"2025-06-03T20:52:35.064Z","modified":"2025-06-04T20:32:18.609Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical","assessor":"cna"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:32:41.089134Z"}],"euvd":[{"id":"EUVD-2025-16787","description":"Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. Versions 8.0.0-BETA3 prior to 8.3.1 contain a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data. Applications using the Auth0-PHP SDK are affected, as are applications using the Auth0/symfony, Auth0/laravel-auth0, or Auth0/wordpress SDKs, because those SDKsrely on the Auth0-PHP SDK versions from 8.0.0-BETA3 until 8.14.0. Version 8.3.1 contains a patch for the issue.","status":"published","published":"2025-06-03T20:52:35Z","modified":"2025-06-04T20:32:18Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical"}],"updated_at":"2026-11-02T20:32:29.680736Z"}],"ghsa":[{"id":"GHSA-v9m8-9xxp-q492","title":"Auth0-PHP SDK Deserialization of Untrusted Data vulnerability","description":"**Overview**\nThe Auth0 PHP SDK contains a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data.\n\n**Am I Affected?**\nYou are affected by this vulnerability if you meet the following preconditions:\n\n1. Applications using the Auth0-PHP SDK, versions between 8.0.0-BETA3 to 8.3.0. \n2. Applications using the following SDKs that rely on the Auth0-PHP SDK versions between 8.0.0-BETA3 to 8.3.0:\n    a. Auth0/symfony,\n    b. Auth0/laravel-auth0,\n    c. Auth0/wordpress.\n\n**Fix**\nUpgrade Auth0/Auth0-PHP to 8.3.1.\n\n**Acknowledgement**\nOkta would like to thank Andreas Forsblom for discovering this vulnerability.","status":"published","published":"2025-06-04T20:31:39Z","modified":"2025-06-04T22:56:43Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:38:45.948817Z"}],"nvd":[{"id":"CVE-2025-48951","description":"Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. Versions 8.0.0-BETA3 prior to 8.3.1 contain a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data. Applications using the Auth0-PHP SDK are affected, as are applications using the Auth0/symfony, Auth0/laravel-auth0, or Auth0/wordpress SDKs, because those SDKsrely on the Auth0-PHP SDK versions from 8.0.0-BETA3 until 8.14.0. Version 8.3.1 contains a patch for the issue.","status":"published","published":"2025-06-03T21:15:21.84Z","modified":"2026-06-17T09:30:32.647Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:11:10.143444Z"}],"osv":[{"id":"CVE-2025-48951","title":"Auth0-PHP SDK Deserialization of Untrusted Data vulnerability","description":"Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. Versions 8.0.0-BETA3 prior to 8.3.1 contain a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data. Applications using the Auth0-PHP SDK are affected, as are applications using the Auth0/symfony, Auth0/laravel-auth0, or Auth0/wordpress SDKs, because those SDKsrely on the Auth0-PHP SDK versions from 8.0.0-BETA3 until 8.14.0. Version 8.3.1 contains a patch for the issue.","status":"published","published":"2025-06-03T20:52:35.064Z","modified":"2026-10-28T02:30:50.173177486Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:44:50.037003Z"},{"id":"GHSA-v9m8-9xxp-q492","title":"Auth0-PHP SDK Deserialization of Untrusted Data vulnerability","description":"**Overview**\nThe Auth0 PHP SDK contains a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data.\n\n**Am I Affected?**\nYou are affected by this vulnerability if you meet the following preconditions:\n\n1. Applications using the Auth0-PHP SDK, versions between 8.0.0-BETA3 to 8.3.0. \n2. Applications using the following SDKs that rely on the Auth0-PHP SDK versions between 8.0.0-BETA3 to 8.3.0:\n    a. Auth0/symfony,\n    b. Auth0/laravel-auth0,\n    c. Auth0/wordpress.\n\n**Fix**\nUpgrade Auth0/Auth0-PHP to 8.3.1.\n\n**Acknowledgement**\nOkta would like to thank Andreas Forsblom for discovering this vulnerability.","status":"published","published":"2025-06-04T20:31:39Z","modified":"2026-02-04T04:39:22.262305Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:46:56.981655Z"}]}}