CVE-2026-53502: Path Traversal

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.

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Weakness Type (CWE)

CWE-22 Path Traversal

References

Other References

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

Frequently Asked Questions

What is 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.

How do I check if I'm vulnerable to CVE-2026-53502? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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