CVE-2026-53502 - Vulnerability Details - OpenCVE

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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable yes

Technical Impact partial

No data.

No data.

No data.

No data.

References

Link	Providers
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

History

Fri, 31 Jul 2026 20:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Fri, 31 Jul 2026 19:15:00 +0000

Type	Values Removed	Values Added
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.
Title		Thumbor has path traversal via post-validation URL decoding bypass in file_loader
Weaknesses		CWE-22
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
Metrics		cvssV4_0 `{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}`

MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-07-31T19:03:16.522Z

Updated: 2026-07-31T19:18:09.047Z

Reserved: 2026-06-09T17:05:25.059Z

Link: CVE-2026-53502

Vulnrichment

Updated: 2026-07-31T19:17:12.904Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

No data.

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