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CVE-2026-19712— Masteriyo LMS < 2.3.3 - Instructor+ Stored XSS via Quiz Description

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 插件的 2.3.3 版本之前，存在一个漏洞，该插件在将测验字段输出到页面之前，并未对其进行适当的清理和转义处理。这一缺陷允许具有讲师角色的用户存储未经过滤的 HTML 内容，从而使得这类用户可以对访问受影响页面的任何用户（包括管理员）执行已存储的跨站脚本（XSS）攻击。 该问题影响默认的单站点安装。运行多站点网络或配置了 DISALLOW_UNFILTERED_HTML 参数的站点不受影响，因为在这些情况下，系统不会授予此类能力。

AI Predicted 6.1 Difficulty: Easy EPSS 0.25% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Masteriyo LMS < 2.3.3 affected
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I. Basic Information for CVE-2026-19712

Vulnerability Information
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Vulnerability Title
Masteriyo LMS < 2.3.3 - Instructor+ Stored XSS via Quiz Description
Source: CVE Program / CVE List V5
Vulnerability Description
The Masteriyo LMS WordPress plugin before 2.3.3 does not sanitise and escape a quiz field before outputting it back in a page, and grants its instructor role the ability to store unfiltered HTML, allowing such users to perform Stored Cross-Site Scripting attacks against any visitor of the affected page, including administrators. This affects default single-site installations. Sites running multisite, or defining DISALLOW_UNFILTERED_HTML, are not affected as the capability is not granted there.
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 ~ 2.3.3 -

II. Public POCs for CVE-2026-19712

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III. Intelligence Information for CVE-2026-19712

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Vendor Advisories for CVE-2026-19712 (1)

Same Patch Batch · Unknown · 2026-08-16 · 12 CVEs total

CVE-2026-19726 Visualizer < 4.0.7 - Contributor+ Cross-User Chart Configuration Disclosure
CVE-2026-19728 Extra Product Options Builder for WooCommerce < 1.2.176 - Unauthenticated Customer File Di
CVE-2026-19725 WPvivid Backup & Migration < 0.9.131 - Unauthenticated Path Traversal via send_to_site_con
CVE-2026-18653 WP Directory Kit < 1.5.7 - Admin+ SQL Injection via section Parameter
CVE-2026-19613 ECS < 4.3.10 - Contributor+ Arbitrary Post Meta Disclosure via Dynamic Repeater ACF Source
CVE-2026-19717 CatFolders Document Gallery < 2.0.7 - Unauthenticated Attachment Disclosure via REST API
CVE-2026-19714 Simple JWT Login < 3.6.8 - Unauthenticated Account Takeover via Missing Google id_token Au
CVE-2026-19711 Premium Packages – Sell Digital Products Securely < 7.0.7 - Subscriber+ Arbitrary Amount W
CVE-2026-15384 Manual Image Crop < 1.15 - Subscriber+ Arbitrary Attachment Image Overwrite via IDOR
CVE-2026-13712 Divi 5.0 - 5.8.1 - Contributor+ Stored XSS via Social Media Follow Skype URL
CVE-2026-17533 All-in-One WP Migration and Backup < 7.108 - Multisite Subsite Admin+ Network-Wide PHP Cod

IV. Related Vulnerabilities

Same product: Masteriyo LMS
Same vendor: Unknown

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