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CVE-2026-82850— Masteriyo LMS < 3.4.2 - Subscriber+ Quiz Answer Key Disclosure

Quick assessment

Affected
Unknown Masteriyo LMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Masteriyo LMS WordPress 插件 3.4.2 版本之前，插件未对测验答案密钥的访问进行限制，导致任何经过身份验证的用户（例如学生）都可以获取站点上任意测验的正确答案，包括其未注册的课程中的测验。由于仅对固定类型的问题应用了隐藏答案的脱敏措施，因此对于其他所有类型的问题，只要用户能够查看问题，其完整答案就会被返回给任何可访问该问题的用户。

AI Predicted 5.0 Difficulty: Easy EPSS 0.18% · P6
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I. Basic Information for CVE-2026-82850

Vulnerability Information
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Vulnerability Title
Masteriyo LMS < 3.4.2 - Subscriber+ Quiz Answer Key Disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown Masteriyo LMS 0 ~ 3.4.2 -

II. Public POCs for CVE-2026-82850

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III. Intelligence Information for CVE-2026-82850

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Other References for CVE-2026-82850 (1)

Same Patch Batch · Unknown · 2026-09-24 · 16 CVEs total

CVE-2026-93662 Events Manager 7.4.1 - 7.4.4 - Subscriber+ Unpublished Event and Location Disclosure via '
CVE-2026-93661 Events Manager < 7.4.5 - Contributor+ Arbitrary Ticket Overwrite via IDOR
CVE-2026-88847 MasterStudy LMS < 3.7.50 - Subscriber+ Lesson Completion Record Creation
CVE-2026-89004 WPeMatico RSS Feed Fetcher < 2.8.26 - Contributor+ Campaign Configuration and Log Disclosu
CVE-2026-89005 WPeMatico RSS Feed Fetcher < 2.8.26 - Contributor+ Stored XSS via Word to Category
CVE-2026-89002 WPeMatico RSS Feed Fetcher < 2.8.26 - Contributor+ Stored XSS via Campaign Item Preview
CVE-2026-88843 MasterStudy LMS 3.5.29 - < 3.7.50 - Contributor+ LFI via Elementor Courses Categories Widg
CVE-2026-88846 MasterStudy LMS 2.3.0 - < 3.7.50 - Unauthenticated Account Creation with Registration Disa
CVE-2026-88845 MasterStudy LMS 2.3.0 - < 3.7.50 - Subscriber+ Course and Lesson Creation via Demo Import
CVE-2026-82195 10Web Booster < 2.34.0 - Unauthenticated Connection Secret Disclosure and Deletion
CVE-2026-82849 Masteriyo LMS < 3.4.2 - Subscriber+ Arbitrary User Course Progress Disclosure via IDOR
CVE-2026-84151 The Post Grid < 7.9.5 - Contributor+ Stored HTML/iframe Injection via wp_kses_post Allow-L
CVE-2026-74991 WPForms Lite 1.8.8.2 - 2.0.1.1 - Unauthenticated Stripe Refund and Subscription Cancellati
CVE-2026-80338 CMB2 < 2.13.0 - Subscriber+ Arbitrary Option Corruption via oEmbed Handler
CVE-2026-80513 wpForo Forum < 3.1.6 - Subscriber+ PHP Object Injection via Profile Fields

IV. Related Vulnerabilities

Same product: Masteriyo LMS
Same vendor: Unknown

V. Comments for CVE-2026-82850

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