CVE-2026-66651

Deferred Deferred - Pending Action

Unauthenticated Broken Access Control in MultiVendorX

Publication date: 2026-08-18

Last updated on: 2026-08-20

Assigner: Patchstack

Description

Unauthenticated Broken Access Control in MultiVendorX <= 5.0.14 versions.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-18

Last Modified

2026-08-20

Generated

2026-09-07

AI Q&A

2026-08-18

EPSS Evaluated

2026-09-06

NVD

CVE-2026-66651

EUVD

EUVD-2026-60931

Affected Vendors & Products

Vendor	Product	Version / Range
multivendorx	multivendorx	to 5.0.14 (inc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Executive Summary

This is an unauthenticated broken access control vulnerability in MultiVendorX plugin versions up to 5.0.14. It allows unauthorized users to access or modify data without proper authentication.

Detection Guidance

Since this is an unauthenticated broken access control issue in MultiVendorX <= 5.0.14, check for unauthorized access to restricted endpoints or data by reviewing server logs for unusual requests or access patterns. Verify if user roles or permissions are being bypassed by testing endpoints manually or with automated tools.

Impact Analysis

An attacker could exploit this to gain unauthorized access to sensitive data, perform unauthorized actions, or escalate privileges within the system.

Compliance Impact

The vulnerability allows unauthenticated access control bypass, which could lead to unauthorized data exposure or modification. This may violate GDPR's data protection principles or HIPAA's access control requirements if exploited in systems handling protected health or personal data.

Mitigation Strategies

Update MultiVendorX to the latest version (5.0.15 or higher) to patch the unauthenticated broken access control vulnerability.

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