CVE-2026-53502

UNKNOWN 0.0

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

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	thumbor
Product	thumbor
Published	Jul 31, 2026
Last Updated	Jul 31, 2026

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Affected Versions

thumbor / thumbor

< 7.8.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/thumbor/thumbor/security/advisories/GHSA-cj54-hpcc-gj6h github.com: https://github.com/thumbor/thumbor/commit/3b986d13677b30fe6651c8c72ebb25957ac0a40d github.com: https://github.com/thumbor/thumbor/releases/tag/7.8.0