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

​CVE ID :CVE-2026-53502

Published : July 31, 2026, 7:17 p.m. | 36 minutes ago

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

Severity: 8.7 | HIGH

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