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PatchSiren cyber security CVE debrief

CVE-2026-4333 thimpress CVE debrief

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.

Vendor
thimpress
Product
LearnPress – WordPress LMS Plugin for Create and Sell Online Courses
CVSS
MEDIUM 6.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-24
Advisory published
2026-04-08
Advisory updated
2026-07-24

Who should care

Users of the LearnPress – WordPress LMS Plugin plugin for WordPress, particularly those with Contributor-level access and above, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

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. The vulnerability is caused by insufficient input sanitization and output escaping on the 'skin' shortcode attribute. An authenticated attacker with Contributor-level access and above can inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Defensive priority

Medium

Recommended defensive actions

  • Update the LearnPress – WordPress LMS Plugin plugin to a version that fixes this vulnerability.
  • Implement input sanitization and output escaping for the 'skin' shortcode attribute.
  • Restrict access to the learn_press_courses shortcode to prevent unauthorized users from injecting arbitrary web scripts.
  • Monitor for suspicious activity and implement additional security measures as needed.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record was published on 2026-04-08T05:16:06.683Z and was last modified on 2026-07-24T20:10:00.147Z. The NVD entry is currently Deferred. Evidence is limited to public sources and may not reflect the full scope of affected systems or potential impact. Defenders should verify the vulnerability's existence and affected versions in their environment, focusing on Contributor-level access and above.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-4333 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-4333

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-4333 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-4333

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/learnpress/tags/4.3.2.8/inc/Shortcodes/Courses/ListCoursesShortcode.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/learnpress/tags/4.3.2.8/inc/Shortcodes/Courses/ListCoursesShortcode.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/learnpress/trunk/inc/Shortcodes/Courses/ListCoursesShortcode.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/learnpress/trunk/inc/Shortcodes/Courses/ListCoursesShortcode.php

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.