CVE-2026-48559
CVE-2026-48559 is a medium-severity vulnerability with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 5.4)
- CVSS v4: 5.1
- EPSS exploit prediction: 0% (7th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-33640
- Weakness: CWE-79
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2026-48559?
- CVE-2026-48559 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2026-48559 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-48559?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-48559 have an EU (EUVD) identifier?
- Yes. CVE-2026-48559 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33640.
- When was CVE-2026-48559 published?
- CVE-2026-48559 was published on 2026-06-01 and last updated on 2026-06-17.
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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