CVE-2026-53502 Thumbor has path traversal via post-validation URL decoding bypass in file_loader

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, fileloader decodes percent-encoded path segments after its root-boundary validation, allowing traversal outside FILELOADERROOTPATH through watermark or frame filter input. This issue is fixed in 7.8.0...