What’s Vulnerable › Vulnerabilities

CVE-2026-13443: Tutor LMS <= 3.9.13 - Authenticated (Author+) Stored Cross-Site Scripting via Lesson Attachment Title

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-01 · updated 2026-07-01
• Weakness: CWE-79

Description

The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Lesson Attachment Title in all versions up to, and including, 3.9.13 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• themeum Tutor LMS – eLearning and online course solution: through 3.9.13

References

• https://plugins.trac.wordpress.org/browser/tutor/tags/3.9.13/classes/Utils.php#L1688
• https://plugins.trac.wordpress.org/browser/tutor/tags/3.9.13/classes/Utils.php#L1720
• https://plugins.trac.wordpress.org/browser/tutor/tags/3.9.13/templates/global/attachments.php#L34
• https://plugins.trac.wordpress.org/browser/tutor/tags/3.9.9/classes/Utils.php#L1688
• https://plugins.trac.wordpress.org/browser/tutor/tags/3.9.9/classes/Utils.php#L1720
• https://plugins.trac.wordpress.org/browser/tutor/tags/3.9.9/templates/global/attachments.php#L34
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3590029%40tutor&new=3590029%40tutor&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/7483762c-5356-4844-90a9-511d9ec48625?source=cve

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