XSS in Fluentcms
CVE-2025-15549
FluentCMS 2026 contains a stored cross-site scripting vulnerability that allows authenticated administrators to upload SVG files with embedded JavaScript via the File Management module. Attackers can upload malicious SVG files that execute JavaScript in the browser of any user accessing the uploaded file URL.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (16.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.4% 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: +0.000
Affected products
- Fluentcms — versions 0
Weakness classification (CWE)
References
- github.com/fluentcms/FluentCMS/issues/2404 (issue-tracking, Exploit, Vendor Advisory)
- www.vulncheck.com/advisories/fluentcms-stored-xss-via-svg-upload-in-file-manage… (VDB Entry, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2025-15549?
- CVE-2025-15549 is a medium-severity vulnerability in Fluentcms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-01-29.
- How severe is CVE-2025-15549?
- Medium severity. CVSS v3 base score is 4.8 out of 10.