CVE-2026-48559
Lightweight Music Server 3.76.0 Stored XSS via Media File Metadata Tags
- State
- Published
- Severity
- 5.1 Medium
- Published
- Jun 1, 2026
- Updated
- Jul 28, 2026
- Reserved
- May 21, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 5.4 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
lmsepoupon |
|
References
- https://www.zeroscience.mk/#/advisories/ZSL-2026-5987technical-descriptionexploit
- https://github.com/epoupon/lms/issues/844issue-tracking
- https://github.com/epoupon/lms/milestone/94
- https://www.vulncheck.com/advisories/lightweight-music-server-stored-xss-via-media-file-metadata-tagsthird-party-advisory
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