Stored XSS via unsanitized public SVG uploads
Published Jan 29, 2026 · Updated Jan 29, 2026
Stored XSS in FluentCMS 0.0.5 and earlier allows remote authenticated users to execute JavaScript through uploaded SVG files. The File Management upload path accepts SVG content without sanitizing embedded scripts, stores it in a public directory, and serves it without restrictive security headers. Administrator access is required to plant the file, and JavaScript runs in the browser of any user who visits its public URL, enabling actions in that user's session.
Summary
What happened
Stored XSS in FluentCMS 0.0.5 and earlier allows remote authenticated users to execute JavaScript through uploaded SVG files. The File Management upload path accepts SVG content without sanitizing embedded scripts, stores it in a public directory, and serves it without restrictive security headers. Administrator access is required to plant the file, and JavaScript runs in the browser of any user who visits its public URL, enabling actions in that user's session.
The record
- CVE
- CVE-2025-15549
- Published
- Jan 29, 2026
- Updated
- Jan 29, 2026
- Vendor
- FluentCMS
- Product
- FluentCMS
- Classifications
- CWE-79, T1204.001
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jan 29, 2026CVE publishedPublication date reported by the CVE source.
- Jan 29, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=0.0.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GitHub Issue 2404 SVG upload proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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