Authenticated file deletion via backslash path traversal
Published Feb 21, 2026 · Updated Feb 21, 2026
Path traversal in MegaGao production_ssm allows remote authenticated users to delete arbitrary server files through /file/delete. FileController removes only forward-slash path segments from fileName, after which FileServiceImpl.deleteFile resolves backslash traversal sequences against the upload directory and deletes the resulting file. A valid low-privilege session is required; deletion is limited to files writable by the server process and can corrupt application data or interrupt service.
Summary
What happened
Path traversal in MegaGao production_ssm allows remote authenticated users to delete arbitrary server files through /file/delete. FileController removes only forward-slash path segments from fileName, after which FileServiceImpl.deleteFile resolves backslash traversal sequences against the upload directory and deletes the resulting file. A valid low-privilege session is required; deletion is limited to files writable by the server process and can corrupt application data or interrupt service.
The record
- CVE
- CVE-2026-2863
- Published
- Feb 21, 2026
- Updated
- Feb 21, 2026
- Vendor
- MegaGao
- Product
- production_ssm
- Classifications
- CWE-22, T1485
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 21, 2026CVE publishedPublication date reported by the CVE source.
- Feb 21, 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=4288d53bd35757b27f2d070057aefb2c07bdd097
What conditions does exploitation require?
What is affected?
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
- GitHub issue 37 file-deletion reproduction requestproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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