CVE-2026-66651

MultiVendorX – WooCommerce Multivendor Marketplace AI Powered Solutions <= 5.0.14 - Missing Authorization

2026-08-18 00:00

Strategic Overview

Status: Unpatched
Affected Plugin: MultiVendorX – WooCommerce Multivendor Marketplace AI Powered Solutions
Affected Version: <= 5.0.14
CVSS: 5.3Medium
Weakness type: CWE-862 · Missing Authorization
CVE: CVE-2026-66651

View all MultiVendorX – WooCommerce Multivendor Marketplace AI Powered Solutions vulnerabilities

At a glance

CVE-2026-66651 is a medium-severity Missing Authorization vulnerability in the MultiVendorX WordPress plugin, affecting versions <= 5.0.14. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. No fixed release has been reported yet; treat installations running this software as exposed. Disclosed August 2026, reported by Jakub Herman.

Vulnerability Overview

The MultiVendorX – WooCommerce Multivendor Marketplace AI Powered Solutions plugin for WordPress is vulnerable to unauthorized access in all versions up to, and including, 5.0.14. This is due to a missing capability check on a function. This makes it possible for unauthenticated attackers to perform an unauthorized action.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-862: Missing Authorization

Reaching this weakness in MultiVendorX <= 5.0.14 takes a caller who can reach the endpoint. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. No fixed build of this plugin is recorded for MultiVendorX yet, so installs running <= 5.0.14 stay exposed until the vendor ships one.

Remediation

No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. No patched version is recorded yet, which is the case where a filtering layer matters most, because there is nothing to update to.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-66651 https://www.wordfence.com/threat-intel/vulnerabilities/id/41a2d4db-3032-476f-91d0-c4b6dcbc61e7 https://nvd.nist.gov/vuln/detail/CVE-2026-66651

Related records

Same weakness class

Other vulnerabilities in MultiVendorX – WooCommerce Multivendor Marketplace AI Powered Solutions

CVSS Vector

5.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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