Authenticated arbitrary file write via upload filename traversal
Published Jul 22, 2025 · Updated Jul 23, 2025
Path traversal in pyLoad 0.5.0b3.dev89 allows remote authenticated users to write files outside the upload directory via crafted filenames. The /json/upload handler prefixes file.filename and passes it to os.path.join and file.save without validation, so ../ segments escape the configured storage directory. A valid session and file upload are required; writes are limited to paths accessible to the pyLoad process, but executable or startup locations can enable code execution.
Summary
What happened
Path traversal in pyLoad 0.5.0b3.dev89 allows remote authenticated users to write files outside the upload directory via crafted filenames. The /json/upload handler prefixes file.filename and passes it to os.path.join and file.save without validation, so ../ segments escape the configured storage directory. A valid session and file upload are required; writes are limited to paths accessible to the pyLoad process, but executable or startup locations can enable code execution.
The record
- CVE
- CVE-2025-54140
- Published
- Jul 22, 2025
- Updated
- Jul 23, 2025
- Vendor
- pyLoad
- Product
- pyLoad
- Classifications
- CWE-22, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 22, 2025CVE publishedPublication date reported by the CVE source.
- Jul 23, 2025Record 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=>= 0.5.0b3.dev89, < 0.5.0b3.dev90
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
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Weakness, pattern, technique
Public exploit references
- GHSA-xqpg-92fq-grfg upload traversal proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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