Which versions of Fluentcms are affected by CVE-2025-15549?

Organizations using FluentCMS 2026 should be aware of moderate risk from CVE-2025-15549, a cross-site scripting vulnerability rated CVSS 4.8.

Is there a public PoC exploit available for CVE-2025-15549?

Yes, a public proof-of-concept exploit is available for CVE-2025-15549. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-15549?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Fluentcms CVE-2025-15549

Q: What is the CVSS score of CVE-2025-15549?

CVE-2025-15549 has a CVSS 4.0 base score of 4.8 (Medium). CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-01-29 disclosure@vulncheck.com

XSS Fluentcms

4.8

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

4.8 MEDIUM

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:00 vuln.today

PoC Detected

Mar 10, 2026 - 18:12 vuln.today

Public exploit code

CVE Published

Jan 29, 2026 - 20:16 nvd

MEDIUM 4.8

DescriptionCVE.org

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.

AnalysisAI

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects the File Management component of Fluentcms. 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.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

CVE-2025-15549 vulnerability details – vuln.today

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