Is this vulnerability remotely exploitable?

Yes. In typical NiceGUI deployments where file upload endpoints are exposed over the network, attackers can remotely submit crafted filenames in uploads to attempt path traversal, provided the application code uses `FileUpload.name` directly in filesystem paths.

What level of access does an attacker need to exploit this?

The attacker generally needs the ability to invoke the file upload functionality. If the upload endpoint is public and unauthenticated, no prior authentication is required. If uploads are restricted, the attacker must hold whatever role or credentials are needed to perform a file upload.

What is the safest general fix pattern for affected applications?

The most robust pattern is to ignore client-supplied filenames when constructing filesystem paths: generate a safe, server-side filename (e.g., a UUID) in a fixed upload directory and store the original filename only as non-path metadata. If the original filename must influence the stored name, apply strict sanitization and normalization and verify the final path stays within the expected directory.

Severity:

HIGH RISK

(7.5)

Path Traversal via Unsanitized Filename (CWE-22) in NiceGUI FileUpload.name

CVE-2026-25732

Published:

Feb 6, 2026

Status:

Undergoing Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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CRITICAL

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Account Takeover / Loss of Account Control

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HIGH RISK

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Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Path Traversal

CWE:

CWE-22

Impact:

Arbitrary File Write and Potential Remote Code Execution

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Path Traversal

CWE:

CWE-22

Impact:

Arbitrary File Write and Potential Remote Code Execution

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Path Traversal via Unsanitized Filename (CWE-22) in NiceGUI FileUpload.name

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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