Description

Unauthenticated Broken Access Control in MultiVendorX <= 5.0.14 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-08-18T15:16:59.560Z",
  "pubdate": "2026-08-18T15:16:59.560Z",
  "executiveSummary": "An unauthenticated broken access control vulnerability has been identified in the MultiVendorX plugin in versions less than or equal to 5.0.14. This security flaw allows unauthenticated remote attackers to bypass authorization mechanisms and potentially interact with restricted application functionality or data normally reserved for privileged roles.\nThe vulnerability exposes the affected WordPress installations to unauthorized state changes or data exposure depending on the specific unprotected endpoints exposed by the plugin. Given that no authentication or specialized privileges are required to exploit the flaw, attackers can leverage automated scripts to scan and interact with vulnerable endpoints across exposed network perimeters.\nThe risk implication is critical due to the lack of pre-requisite conditions for exploitation, potentially leading to unauthorized administrative actions, data leakage, or privilege escalation within the context of the WordPress multi-vendor ecosystem. Remediation requires updating the MultiVendorX plugin beyond the affected version threshold to restore proper access control enforcement.",
  "technicalDetails": "The vulnerability resides in the access control implementation of the MultiVendorX plugin for versions <= 5.0.14. Specifically, the root cause stems from missing or improperly validated capability checks and authorization verifications on sensitive functions or AJAX endpoints exposed by the plugin.\nIn a standard WordPress architecture, administrative or vendor-specific functionalities must validate user sessions, nonces, and user capabilities (such as manage_woocommerce or vendor-specific roles) prior to executing backend logic or processing data modifications. In this vulnerability, the affected component fails to enforce these checks, allowing unauthenticated HTTP requests to successfully invoke restricted routines.\nThe attack flow proceeds as follows: 1) The attacker identifies the exposed vulnerable endpoints or AJAX actions associated with the MultiVendorX plugin via automated crawling or source code analysis. 2) The attacker crafts an arbitrary HTTP GET or POST request directed at the vulnerable endpoint without supplying session cookies, authentication tokens, or valid nonces. 3) The server processes the incoming request, bypassing the absent access control checks. 4) The underlying function executes with the permissions of the web server context, yielding unauthorized access to restricted features, sensitive data retrieval, or unintended state modifications.\nThe vulnerability is exposed over the network via standard HTTP/HTTPS protocols. Since the requirement for exploitation is strictly unauthenticated, any remote threat actor with network access to the target WordPress site can initiate the attack payload. The post-exploitation impact varies depending on the specific capabilities exposed by the unprotected functions, potentially ranging from information disclosure of vendor data to unauthorized manipulation of marketplace configurations."
}