CVE-2024-13670: Music Sheet Viewer <= 4.1 - Authenticated (Contributor+) Stored Cross-Site Scripting

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-01-30 · updated 2026-06-17
Weakness: CWE-79

Description

The Music Sheet Viewer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'pn_msv' shortcode in all versions up to, and including, 4.1 due to insufficient input sanitization and output escaping on user supplied attributes. 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.

Affected products

efreja Music Sheet Viewer: through 4.1

References

https://plugins.trac.wordpress.org/browser/music-sheet-viewer/trunk/music-sheet-viewer.php#L395
https://www.wordfence.com/threat-intel/vulnerabilities/id/8ec4eb8a-7b03-4392-9137-4f17622bfe54?source=cve

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