Vulnerability · Published Jan 29, 2026 · Assigned by VulnCheck
CVE-2025-15549FluentCMS 2026 Stored XSS via SVG Upload in File Management
Medium 4.8
In plain English
A medium-severity cross-site scripting in FluentCMS from FluentCMS. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).
Severity (CVSS 3.1)4.8Medium
Exploit odds (30 days)0.3%top 82.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
References
- GitHub Issue #2404 issue-tracking
- VulnCheck Advisory: FluentCMS 2026 Stored XSS via SVG Upload in File Management third-party-advisory