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Thumbor Path Traversal via URL Decoding Bypass

Thumbor version 7.7.7 and earlier is vulnerable to arbitrary file read via a path traversal flaw in file_loader.py, where security checks are performed before decoding percent-encoded traversal sequences.

Thumbor web-application-vulnerability hmac-bypass image-processing cve-2026-53501 ssrf web-application input-validation
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