CVE-2026-62670
Received Received - Intake

Authentication Bypass in Grav Flex Objects Plugin

Publication date: 2026-08-19

Last updated on: 2026-08-19

Assigner: GitHub, Inc.

Description
Grav Flex Objects Plugin allows you to build custom collections of objects. Prior to 1.4.3, the Grav Flex Objects Admin Next API requireFlexPermission() method in classes/Api/FlexApiController.php returns without denying access when a directory blueprint omits config.admin.permissions. An authenticated account with only api.access can use the index, show, create, update, delete, export, and media handlers for a permission-less directory even though the core admin.flex-object. authorization fallback would deny the same actions. This issue is fixed in version 1.4.3.

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Meta Information

Published
2026-08-19
Last Modified
2026-08-19
Generated
2026-08-19
AI Q&A
2026-08-19
EPSS Evaluated
N/A
NVD
CVE-2026-62670
EUVD
EUVD-2026-62537

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
trilbymedia grav-plugin-flex-objects 1.4.3
getgrav grav-plugin-flex-objects 1.4.2

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

This vulnerability is in the Grav Flex Objects Plugin before version 1.4.3. It allows authenticated users with only api.access permission to perform full CRUD operations on directories that lack explicit permission configurations in their blueprints. The requireFlexPermission() function fails to deny access by default when no permissions are defined, allowing unauthorized actions.

Detection Guidance

To detect this vulnerability, check if the Grav Flex Objects plugin version is below 1.4.3. Use commands like 'composer show trilbymedia/grav-plugin-flex-objects' or inspect the plugin directory for version details. Verify API endpoints for permission-less directories by attempting unauthorized access to index, show, create, update, delete, export, or media handlers.

Impact Analysis

An attacker with minimal privileges could exploit this to create, read, update, delete, export, or modify media in directories they should not have access to. This could lead to data theft, corruption, or unauthorized changes in the Grav CMS system.

Compliance Impact

This vulnerability could lead to unauthorized access and modification of sensitive data, violating confidentiality and integrity requirements in GDPR and HIPAA. It may result in non-compliance due to insufficient access controls and audit failures.

Mitigation Strategies

Immediately update the Grav Flex Objects plugin to version 1.4.3 or later. Remove or restrict api.access permissions for users who do not require them. Review directory blueprints to ensure all directories have explicit admin.permissions configured. Monitor API access logs for unusual activity.

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