What’s Vulnerable › Vulnerabilities

CVE-2026-48559: Lightweight Music Server 3.76.0 Stored XSS via Media File Metadata Tags

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-01 · updated 2026-07-22
• Weakness: CWE-79

Description

Lightweight Music Server (LMS) though 3.76.0 contains a stored cross-site scripting vulnerability that allows attackers to execute arbitrary JavaScript by embedding malicious HTML in media file metadata tags such as GENRE, ARTIST, or ALBUM. Attackers can introduce a crafted media file into the victim's library, causing the payload to be saved during library scanning and executed automatically in the web interface due to tag content being rendered using Wt::TextFormat::UnsafeXHTML without sanitization in src/lms/ui/Utils.cpp.

Affected products

• epoupon lms: through 3.76.0

References

• https://github.com/epoupon/lms/issues/844
• https://github.com/epoupon/lms/milestone/94
• https://www.vulncheck.com/advisories/lightweight-music-server-stored-xss-via-media-file-metadata-tags
• https://www.zeroscience.mk/#/advisories/ZSL-2026-5987

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