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CVE-2026-82845

Masteriyo LMS < 3.4.1 - Subscriber+ PHP Object Injection

The Masteriyo LMS WordPress plugin before 3.4.1 does not prevent user-supplied values held as metadata from being deserialized when they are read back, allowing users with a minimal account to inject arbitrary PHP objects and, by way of a class shipped in a library bundled with the Masteriyo LMS WordPress plugin before 3.4.1, write and execute arbitrary code on the server. A weaker form of the same issue is reachable without an account and yields an arbitrary file write rather than code execution.

CVSS 3.1 · 9.9 Critical EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions
Products
Masteriyo Lms
CVE-2026-82847

Masteriyo LMS < 3.4.1 - Instructor+ Stored XSS via Course Highlights

The Masteriyo LMS WordPress plugin before 3.4.1 does not sanitise and escape one of its course fields before outputting it back in the course editor, allowing users with the instructor role to perform Stored Cross-Site Scripting attacks against higher privileged users such as administrators.

CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions
Products
Masteriyo Lms
CVE-2026-82851

Masteriyo LMS 1.14.0 - 3.4.0 - Instructor+ Arbitrary Post Disclosure via IDOR

The Masteriyo LMS WordPress plugin before 3.4.1 does not verify ownership of, or restrict the type of, the records a user requests for download, allowing users with the instructor role to retrieve the full content and metadata of arbitrary posts, including other instructors' private and draft courses.

CVSS 3.1 · 2.7 Low EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions
Products
Masteriyo Lms
CVE-2026-82848

Masteriyo LMS 1.3.1 - 2.3.3 - Unauthenticated Course Enrollment Disclosure

The Masteriyo LMS WordPress plugin before 3.4.0 does not perform any authorization check before returning a course enrolment record over its REST API, allowing unauthenticated users to read any learner's enrolment status, timestamps and course-progress data by walking sequential record identifiers. A related gap lets any enrolled user retrieve other learners' enrolment records as well.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions
Products
Masteriyo Lms
CVE-2026-82849

Masteriyo LMS < 3.4.2 - Subscriber+ Arbitrary User Course Progress Disclosure via IDOR

The Masteriyo LMS WordPress plugin before 3.4.2 does not verify that the user making the request owns the course-progress records being returned, allowing any authenticated user, such as a self-registered subscriber, to read another user's learning activity. The ownership check it applies is skipped whenever the requested account is not named with a non-zero value, in which case the records of every learner on the site are returned at once.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions
Products
Masteriyo Lms
CVE-2026-82850

Masteriyo LMS < 3.4.2 - Subscriber+ Quiz Answer Key Disclosure

The Masteriyo LMS WordPress plugin before 3.4.2 does not restrict access to quiz answer keys, allowing any authenticated user, such as a student, to retrieve the correct answers for any quiz on the site, including quizzes in courses they are not enrolled in. The redaction that hides them is applied only to a fixed list of question types, so the answers to every other type are returned in full to anyone able to view the questions.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions
Products
Masteriyo Lms