XSS in Epoupon Lms
CVE-2026-48559
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Epoupon Lms — versions 0
Weakness classification (CWE)
References
- www.zeroscience.mk/ (technical-description, exploit)
- github.com/epoupon/lms/issues/844 (issue-tracking)
- github.com/epoupon/lms/milestone/94
- www.vulncheck.com/advisories/lightweight-music-server-stored-xss-via-media-file… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-48559?
- CVE-2026-48559 is a medium-severity vulnerability in Epoupon Lms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-06-01.
- How severe is CVE-2026-48559?
- Medium severity. CVSS v3 base score is 5.4 out of 10.