{"id":"CVE-2026-88963","title":"Tutor LMS <= 4.0.8 - Authenticated (Subscriber+) Reflected DOM-Based Cross-Site Scripting via 'redirect_url' Parameter","summary":"The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to DOM-Based Cross-Site Scripting via the 'redirect_url' parameter in versions up to, and including, 4.0.8 This is due to insufficient input validati…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-79"],"vendor":"themeum","product":"Tutor LMS – eLearning and online course solution","affected":["tutor_lms_elearning_and_online_course_solution <= 4.0.8"],"published":"2026-10-16","updated":"2026-10-16","sourceUpdated":"2026-10-16T05:30:27.816Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-88963","references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/f39a9570-a352-45f3-8644-2de2c1c709d2?source=cve"},{"url":"https://plugins.trac.wordpress.org/changeset?reponame=&new=3700174%40tutor%2Ftags%2F4.0.9&old=3690454%40tutor%2Ftags%2F4.0.8"},{"url":"https://plugins.trac.wordpress.org/changeset/3700174/tutor/trunk/assets/js/tutor-order-details.js"}],"tags":["cve.org"],"ingestedAt":"2026-10-16T06:00:00.388Z","slug":"CVE-2026-88963","body":"## Overview\n\nThe Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to DOM-Based Cross-Site Scripting via the 'redirect_url' parameter in versions up to, and including, 4.0.8 This is due to insufficient input validation in the Topbar component's back button handler. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute in the victim's browser whenever the victim accesses a page that includes the malicious payload.\n\n## Affected\n\n- `tutor_lms_elearning_and_online_course_solution <= 4.0.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}