Description

Unauthenticated Broken Access Control in MultiVendorX <= 5.0.10 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-08-13T14:17:05.503Z",
  "pubdate": "2026-08-13T14:17:05.503Z",
  "executiveSummary": "An unauthenticated broken access control vulnerability exists in the MultiVendorX plugin for WordPress, specifically affecting all versions up to and including 5.0.10. This security flaw stems from inadequate permission validation mechanisms within the application logic, allowing remote unauthenticated threat actors to interact with sensitive endpoints or perform restricted functionalities intended solely for authorized users or privileged administrators. The primary impact of this vulnerability involves unauthorized access to sensitive application data, potential modification of restricted system parameters, or execution of privileged operations without prior identity verification. Because the flaw requires no authentication or specialized privileges, the attack vector is exposed directly over the network via standard HTTP requests, significantly lowering the barrier to exploitation. Systems utilizing vulnerable instances of MultiVendorX face heightened exposure to unauthorized data enumeration and privilege abuse, which could compromise the overall integrity and confidentiality of the underlying WordPress installation. Remediation requires updating the affected software to a patched version once released by the vendor, alongside implementing strict network-level access controls and monitoring application access logs for anomalous interaction patterns targeting MultiVendorX endpoints.",
  "technicalDetails": "The vulnerability is classified as a Broken Access Control flaw rooted in the inadequate enforcement of authorization checks within the MultiVendorX codebase for versions <= 5.0.10. In software architectures handling multi-vendor e-commerce operations, specific AJAX actions, REST API endpoints, or direct controller functions are designated to process sensitive merchant or administrative requests. In the case of MultiVendorX up to version 5.0.10, the vulnerable component fails to adequately verify whether the incoming HTTP request originates from an authenticated session possessing the necessary capabilities or role assignments before executing backend business logic.\nExploitation of this vulnerability occurs remotely over the network without requiring any authentication credentials or user interaction. An attacker can craft malicious HTTP requests directed at exposed MultiVendorX endpoints, bypassing frontend UI restrictions entirely. Since the backend handlers lack proper capability checks (such as verifying nonces or checking user roles via current_user_can() equivalents), the application processes the request as if it originated from a legitimate authorized entity. Depending on the specific endpoint targeted, the payload behavior can range from retrieving restricted database records and vendor configurations to executing unauthorized state-changing operations within the e-commerce environment.\nThe attack flow typically proceeds as follows: First, the attacker identifies the target WordPress site running a vulnerable version of MultiVendorX <= 5.0.10 through component fingerprinting. Second, the attacker formulates an HTTP GET or POST request targeting specific vulnerable controller functions or AJAX handlers associated with the plugin. Third, due to the absence of robust access control enforcement, the application processes the request, bypassing authentication barriers. Finally, the server responds with the requested sensitive data or executes the requested unauthorized action, facilitating post-exploitation activities such as data exfiltration, unauthorized modification of marketplace settings, or further privilege escalation within the broader WordPress environment."
}