Unauthenticated arbitrary file write via unsanitized upload filename
Published Feb 6, 2026 · Updated Feb 6, 2026
Path traversal in Zauberzeug NiceGUI before 3.7.0 allows remote attackers to write files outside an intended upload directory. FileUpload.name returns the client-supplied filename unchanged, so application code that joins it to an upload directory and passes the result to save() accepts ../ segments or absolute paths. Exploitation requires a NiceGUI application to expose file upload and use file.name in a filesystem path without sanitization; fixed, generated, or sanitized filenames are not affected.
Summary
What happened
Path traversal in Zauberzeug NiceGUI before 3.7.0 allows remote attackers to write files outside an intended upload directory. FileUpload.name returns the client-supplied filename unchanged, so application code that joins it to an upload directory and passes the result to save() accepts ../ segments or absolute paths. Exploitation requires a NiceGUI application to expose file upload and use file.name in a filesystem path without sanitization; fixed, generated, or sanitized filenames are not affected.
The record
- CVE
- CVE-2026-25732
- Published
- Feb 6, 2026
- Updated
- Feb 6, 2026
- Vendor
- Zauberzeug
- Product
- NiceGUI
- Classifications
- CWE-22, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 6, 2026CVE publishedPublication date reported by the CVE source.
- Feb 6, 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?
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- Affected versionversion=< 3.7.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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