CVE-2026-53502
Received Received - Intake

Path Traversal in Thumbor Prior to 7.8.0

Publication date: 2026-07-31

Last updated on: 2026-07-31

Assigner: GitHub, Inc.

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-07-31
Last Modified
2026-07-31
Generated
2026-08-01
AI Q&A
2026-07-31
EPSS Evaluated
N/A
NVD
CVE-2026-53502
EUVD
EUVD-2026-51612

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
globo.com thumbor to 7.8.0 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

Thumbor is a photo thumbnail service. Prior to version 7.8.0, a flaw in the file_loader component allows attackers to bypass root directory restrictions by using percent-encoded path segments in watermark or frame filters. This enables directory traversal outside the intended FILE_LOADER_ROOT_PATH.

Detection Guidance

To detect this vulnerability, check the Thumbor version installed on your system. If it is below 7.8.0, the system is vulnerable. Run: thumbor --version to verify the version.

Impact Analysis

An attacker could access or manipulate files outside the intended directory, potentially leading to unauthorized data exposure, file corruption, or remote code execution if combined with other vulnerabilities. Systems using affected Thumbor versions are at risk.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating confidentiality requirements in GDPR and HIPAA. Organizations may face compliance violations, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Upgrade Thumbor to version 7.8.0 or later to address the path traversal vulnerability in file_loader.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-53502. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart