Authenticated file write via slash-counting bypass
Published Jul 20, 2026 · Updated Jul 20, 2026
Path traversal in FileThingie 2.5.7 allows remote authenticated users to write files outside its managed root through ft2.php. The move handler compares ../ sequences in newvalue with the slash count in user-controlled dir, then passes the resulting paths to rename without canonicalizing them. A valid session is required by default; writable destinations can receive attacker-uploaded files, including a PHP web shell when server permissions allow it.
Summary
What happened
Path traversal in FileThingie 2.5.7 allows remote authenticated users to write files outside its managed root through ft2.php. The move handler compares ../ sequences in newvalue with the slash count in user-controlled dir, then passes the resulting paths to rename without canonicalizing them. A valid session is required by default; writable destinations can receive attacker-uploaded files, including a PHP web shell when server permissions allow it.
The record
- CVE
- CVE-2026-51027
- Published
- Jul 20, 2026
- Updated
- Jul 20, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-200, T1190, T1505.003
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 20, 2026CVE publishedPublication date reported by the CVE source.
- Jul 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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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
- Slash-inflation move request proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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