upload-insecure-files

Testing insecure file uploads involves reviewing accept, store, process, and serve stages separately to find validation bypasses, parser differentials, and exploitable upload-to-RCE chains. Analyze double extensions, MIME mismatches, and rename logic for storage abuse.

File upload vulnerabilities leading to XSS and path traversal include cross-tenant overwrite flaws, unsafe file retrieval, preview rendering abuse, and path control issues. Exploitable processing chains transform uploaded content to trigger parser differentials and command injection.

Parser exploitation in archive extraction and media pipelines abuses file processing logic after storage. Attackers upload files with differentials that bypass extension checks, triggering unsafe rendering or extraction that yields path traversal, XXE, or command injection.

Yes, you can assess cross-tenant overwrite and authorization flaws in avatar upload workflows by testing path control and rename logic. Analyze whether storage and retrieval stages allow unauthorized overwrites or unsafe file serving across tenants.

The best way to find MIME mismatch and double extension bypasses is to review the accept and store stages of document imports separately. Test validation logic against parser differentials and unsafe retrieval to expose storage abuse and exploitable processing chains.

Check for unsafe file retrieval and preview rendering vulnerabilities when upload pipelines transform files after storage. Analyze serve stages for parser differentials and cross-tenant overwrite that can chain into XSS, XXE, or command injection.