CVE-2025-15549 | THREATINT

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.

PUBLISHED Reserved 2026-01-29 | Published 2026-01-29 | Updated 2026-02-23 | Assigner VulnCheck

MEDIUM: 4.8CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

MEDIUM: 4.8CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Problem types

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status

unaffected

Any version

affected

Credits

Jarosław Wawiórko finder

Beatriz Fresno Naumova finder

References

github.com/fluentcms/FluentCMS/issues/2404 (GitHub Issue #2404) issue-tracking

www.vulncheck.com/...d-xss-via-svg-upload-in-file-management (VulnCheck Advisory: FluentCMS 2026 Stored XSS via SVG Upload in File Management) third-party-advisory

cve.org (CVE-2025-15549)

nvd.nist.gov (CVE-2025-15549)

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