Path Traversal in Thumbor

CVE-2026-53502

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.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.004 (29.0th percentile) — read the EPSS interpretation.

Affected products

Weakness classification (CWE)

References