CVE-2026-42052: Beetbox Beets

Medium severity, CVSS 6.0. EPSS: 0.5% chance of exploitation in the next 30 days.

Beets is the media library management system. Prior to version 2.10.0, the bundled web UI uses Underscore template interpolation mode <%= ... %> for untrusted metadata fields. In this runtime, <%= ... %> is raw insertion and HTML escaping is only performed by <%- ... %>. Rendered output is then inserted with .html(...), allowing attacker-controlled markup to become active DOM. This issue has been patched in version 2.10.0.

Affected products

• Beetbox Beets: before 2.10.0 (fixed in 2.10.0)

Published 2026-05-04. Last modified 2026-06-23.