What is the CVSS score of EUVD-2026-20045?

EUVD-2026-20045 has a CVSS 3.1 base score of 6.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

WordPress EUVD-2026-20045

| CVE-2026-4333 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-04-08 Wordfence

GHSA-7fvw-v44w-rxj9

WordPress XSS

6.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.4 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

EUVD ID Assigned

Apr 08, 2026 - 04:30 euvd

EUVD-2026-20045

Analysis Generated

Apr 08, 2026 - 04:30 vuln.today

CVE Published

Apr 08, 2026 - 03:36 nvd

MEDIUM 6.4

DescriptionCVE.org

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.

AnalysisAI

Stored Cross-Site Scripting in LearnPress WordPress LMS Plugin up to version 4.3.3 allows authenticated contributors to inject malicious scripts via the 'skin' attribute of the learn_press_courses shortcode, which lacks proper output escaping. The injected scripts execute whenever any user visits a page containing the malicious shortcode, affecting all sites using vulnerable versions. No evidence of active exploitation exists at time of analysis.

Technical ContextAI

The vulnerability resides in the learn_press_courses shortcode handler (ListCoursesShortcode.php), specifically in how the 'skin' attribute parameter is processed. The plugin uses the unsanitized attribute value directly within sprintf() calls to generate HTML class and data-layout attributes without applying WordPress escaping functions like esc_attr(). This represents a classic CWE-79 (Improper Neutralization of Input During Web Page Generation) flaw where user-controlled input flows directly into HTML output context. The root cause is the absence of both input validation and context-aware output escaping; the 'skin' parameter should be validated against a whitelist of allowed values and escaped with esc_attr() before being inserted into HTML attributes.

RemediationAI

Update LearnPress to the patched version released after 4.3.3 (exact version number not specified in available data; check the WordPress plugin repository or ThimPress advisory for the specific release). The fix involves adding esc_attr() escaping around the 'skin' attribute value before it is inserted into HTML attributes within the sprintf() calls in ListCoursesShortcode.php. As a temporary workaround pending patching, WordPress administrators can restrict Contributor-level access to users who genuinely require it, and use role-based access control plugins to limit shortcode usage. Review existing pages and posts for any suspicious shortcode parameters that may indicate prior exploitation. Refer to the Wordfence vulnerability database entry (https://www.wordfence.com/threat-intel/vulnerabilities/id/15fb0a26-e415-4ccb-b83d-d8f7b36bce66) and WordPress plugin repository for official guidance.