CVE-2026-4333: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in thimpress LearnPress – WordPress LMS Plugin for Create and Sell Online Courses
The LearnPress – WordPress LMS Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'skin' attribute of the learn_press_courses shortcode in all versions up to and including 4.3.3. This is due to insufficient input sanitization and output escaping on the 'skin' shortcode attribute. The attribute value is used directly in an sprintf() call that generates HTML (class attribute and data-layout attribute) without any esc_attr() escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AI Analysis
Technical Summary
The LearnPress WordPress LMS Plugin is vulnerable to stored XSS through insufficient sanitization and escaping of the 'skin' shortcode attribute in versions up to 4.3.3. The attribute value is directly inserted into HTML attributes (class and data-layout) via sprintf() without esc_attr() escaping. Authenticated users with Contributor or higher privileges can inject arbitrary scripts that execute when pages containing the shortcode are viewed. This vulnerability is tracked as CVE-2026-4333 with a CVSS 3.1 base score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N). No patch or official fix has been published, and the plugin is not a cloud service.
Potential Impact
Successful exploitation allows authenticated users with Contributor-level or higher privileges to inject persistent malicious scripts into pages via the 'skin' shortcode attribute. These scripts execute in the context of other users viewing the page, potentially leading to information disclosure and integrity impacts. Availability is not affected. The vulnerability requires low attack complexity but does require authenticated access with limited privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor-level access to trusted users only and consider disabling or limiting use of the 'skin' attribute in the learn_press_courses shortcode. Monitor plugin updates from the vendor for a security patch addressing this issue.
CVE-2026-4333: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in thimpress LearnPress – WordPress LMS Plugin for Create and Sell Online Courses
Description
The LearnPress – WordPress LMS Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'skin' attribute of the learn_press_courses shortcode in all versions up to and including 4.3.3. This is due to insufficient input sanitization and output escaping on the 'skin' shortcode attribute. The attribute value is used directly in an sprintf() call that generates HTML (class attribute and data-layout attribute) without any esc_attr() escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The LearnPress WordPress LMS Plugin is vulnerable to stored XSS through insufficient sanitization and escaping of the 'skin' shortcode attribute in versions up to 4.3.3. The attribute value is directly inserted into HTML attributes (class and data-layout) via sprintf() without esc_attr() escaping. Authenticated users with Contributor or higher privileges can inject arbitrary scripts that execute when pages containing the shortcode are viewed. This vulnerability is tracked as CVE-2026-4333 with a CVSS 3.1 base score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N). No patch or official fix has been published, and the plugin is not a cloud service.
Potential Impact
Successful exploitation allows authenticated users with Contributor-level or higher privileges to inject persistent malicious scripts into pages via the 'skin' shortcode attribute. These scripts execute in the context of other users viewing the page, potentially leading to information disclosure and integrity impacts. Availability is not affected. The vulnerability requires low attack complexity but does require authenticated access with limited privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor-level access to trusted users only and consider disabling or limiting use of the 'skin' attribute in the learn_press_courses shortcode. Monitor plugin updates from the vendor for a security patch addressing this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-03-17T14:08:14.694Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d5da2a43e2781badfbe619
Added to database: 4/8/2026, 4:31:38 AM
Last enriched: 4/8/2026, 4:47:55 AM
Last updated: 4/8/2026, 7:41:43 AM
Views: 3
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