CVE-2026-48559Public exploitNetwork attack vectorHinoki check available

Stored XSS via UnsafeXHTML metadata rendering

Published Jun 1, 2026 · Updated Jun 1, 2026

Stored XSS in Lightweight Music Server 3.76.0 and earlier allows remote authenticated users to execute JavaScript via media metadata. src/lms/ui/Utils.cpp passes GENRE, ARTIST, and ALBUM values to Wt::WText with Wt::TextFormat::UnsafeXHTML, so library scanning stores markup that the web interface renders without sanitization. Remote authenticated users must also be able to place a crafted media file in a scanned library; viewing or filtering its imported tags triggers execution.

CVSS severity5.1
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Lightweight Music Server 3.76.0 and earlier allows remote authenticated users to execute JavaScript via media metadata. src/lms/ui/Utils.cpp passes GENRE, ARTIST, and ALBUM values to Wt::WText with Wt::TextFormat::UnsafeXHTML, so library scanning stores markup that the web interface renders without sanitization. Remote authenticated users must also be able to place a crafted media file in a scanned library; viewing or filtering its imported tags triggers execution.

The record

CVE
CVE-2026-48559
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
epoupon
Product
Lightweight Music Server
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 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=0 <=3.76.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

epoupon · Lightweight Music Serverversion=0 <=3.76.0

Published CVSS scores

5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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