CVE-2026-42052
Medium
Description
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.
SeverityMedium
CVSS6.0
Exploit probability—
ProductBeets
PublishedMay 4, 2026
First seenMay 4, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- beets2.10.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| beetsPyPI | v < 2.10.0 | 2.10.0 |
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