CVE-2026-42052

Stored XSS via raw metadata interpolation

Published May 4, 2026 · Updated May 4, 2026

Stored XSS in the beets web plugin before 2.10.0 allows attackers to execute JavaScript through crafted media metadata. Bundled Underscore templates insert artist, album, title, comments, and lyrics fields without HTML escaping before placing the rendered output into the DOM. Exploitation requires the optional web plugin, malicious metadata in the library, and a user who browses the affected entry; the server binds to loopback by default.

CVSS severityUnavailable
Unscored
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the beets web plugin before 2.10.0 allows attackers to execute JavaScript through crafted media metadata. Bundled Underscore templates insert artist, album, title, comments, and lyrics fields without HTML escaping before placing the rendered output into the DOM. Exploitation requires the optional web plugin, malicious metadata in the library, and a user who browses the affected entry; the server binds to loopback by default.

The record

CVE
CVE-2026-42052
Published
May 4, 2026
Updated
May 4, 2026
Vendor
beetbox
Product
beets
Classifications
CWE-79, T1059.007
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. May 4, 2026CVE publishedPublication date reported by the CVE source.
  2. May 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.10.0

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

beetbox · beetsversion=< 2.10.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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