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CVE-2026-42052 — beets is Vulnerable to XSS

Affected: beetbox beets

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.

GHSA-3gxm-wfjx-m847 — beets has a Cross-site Scripting vulnerability

Affected: PyPI: beets

During code logic analyis, an area that may lead to unintended behavior under specific conditions was discovered.

## Overview - Verified Version: `80cd21554124da07d17a4f962c7d770a4f70d0f2` - Vulnerability Type: Stored XSS - Affected Location: `beetsplug/web/templates/index.html:42` - Trigger Scenario: Metadata fields such as `title`, `lyrics`, or `comments` are rendered with raw template interpolation and inserted into DOM via `.html(...)`.

## Root Cause 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.

## Source-to-Sink Chain 1. Source (attacker-controlled input) - Item metadata values (for example `title`, `lyrics`, `comments`) can contain attacker HTML payload.

2. Data flow - Templates in `beetsplug/web/templates/index.html:42-46,87-91` render metadata with `<%= ... %>`. - Underscore runtime defines `<%= ... %>` as raw interpolation (`beetsplug/web/static/underscore.js:890-907`).

3. Sink (security-sensitive action) - Frontend inserts rendered template output into DOM via `$(this.el).html(this.template(this.model.toJSON()));` in `beetsplug/web/static/beets.js:182,208,220`.

## Exploitation Preconditions 1. Victim opens the web UI page that renders attacker-controlled metadata. 2. Metadata includes executa…

PYSEC-2026-2397 — beets has a Cross-site Scripting vulnerability

Affected: PyPI: beets

During code logic analyis, an area that may lead to unintended behavior under specific conditions was discovered.

## Source-to-Sink Chain 1. Source (attacker-controlled input) - Item metadata values (for example `title`, `lyrics`, `comments`) can contain attacker HTML payload.

3. Sink (security-sensitive action) - Frontend inserts rendered template output into DOM via `$(this.el).html(this.template(this.model.toJSON()));` in `beetsplug/web/static/beets.js:182,208,220`.

## Exploitation Preconditions 1. Victim opens the web UI page that renders attacker-controlled metadata. 2. Metadata includes executa…