Description

The BEAR WordPress plugin before 1.2.2 does not verify a CSRF nonce or check user capabilities before updating taxonomy terms, allowing an attacker to modify arbitrary terms by tricking a logged-in privileged user into visiting a crafted page.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-09-12T06:16:26.467Z",
  "pubdate": "2026-09-12T06:16:26.467Z",
  "executiveSummary": "The BEAR WordPress plugin, in versions prior to 1.2.2, contains a critical security flaw involving Cross-Site Request Forgery (CSRF).\nThe vulnerability originates from the absence of mandatory CSRF nonce verification and insufficient capability checks during the process of updating taxonomy terms.\nBy coercing an authenticated administrator or privileged user into accessing a malicious, crafted webpage, an unauthenticated attacker can execute unauthorized state-changing operations.\nThis vulnerability allows an external actor to perform arbitrary modifications to taxonomy terms within the WordPress environment without the victim's consent.\nThe risk is categorized as high, as it facilitates unauthorized data manipulation and potential site-wide configuration changes by bypassing intended security controls.\nThe primary requirement for exploitation is social engineering, whereby an attacker lures a logged-in privileged user to a third-party site containing the malicious trigger.",
  "technicalDetails": "The vulnerability resides in the backend taxonomy management functionality of the BEAR plugin. The root cause of this security defect is the failure to implement standard WordPress security patterns, specifically the 'check_admin_referer()' function or similar nonce verification mechanisms intended to validate that incoming requests originated from a legitimate administrative interface.\nFurthermore, the plugin fails to perform a 'current_user_can()' authorization check, which is essential to ensure that only authorized roles (e.g., Administrators) can initiate modifications to taxonomy data. Because these checks are omitted, the plugin processes state-changing HTTP requests based solely on the presence of expected request parameters, ignoring the security context of the initiator.\nThe attack flow follows a classic CSRF pattern: First, an attacker constructs a malicious payload—typically embedded in an HTML <img> tag, a hidden <iframe>, or a scripted form submission—designed to send a POST or GET request to the vulnerable BEAR plugin endpoint. This request contains the specific arguments required to update or modify a target taxonomy term.\nSecond, the attacker lures an authenticated privileged user (e.g., an administrator) to visit a webpage hosting this malicious code. When the victim loads the page, their browser automatically includes their authenticated session cookies for the target WordPress site along with the malicious request.\nSince the BEAR plugin does not validate the source of the request or the identity of the requester beyond checking for the existence of session cookies, the server treats the request as a legitimate administrative action. This allows the attacker to arbitrarily update, rename, or manipulate taxonomy terms without any direct access to the administrative dashboard.\nThis vulnerability persists across all versions of the BEAR plugin before 1.2.2. The lack of proper request integrity validation allows for complete bypass of WordPress's access control model, leading to potential data corruption and administrative interference. An attacker can leverage this to disrupt site taxonomies, potentially affecting front-end navigation, content categorization, and overall user experience. Post-exploitation, the malicious modification is recorded in the database, effectively altering the site configuration with the authority of the compromised user session."
}