Description

Unauthenticated Broken Access Control in WP Event SOlution <= 4.1.22 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-09-02T12:17:13.657Z",
  "pubdate": "2026-09-02T12:17:13.657Z",
  "executiveSummary": "The WP Event Solution plugin for WordPress, specifically in versions 4.1.22 and below, contains a critical vulnerability categorized as Unauthenticated Broken Access Control.\nThis flaw allows remote, unauthenticated attackers to bypass security restrictions and interact with sensitive administrative or restricted functions that should be gated by proper session validation.\nThe vulnerability poses a severe risk to the integrity and confidentiality of the WordPress installation, as it enables unauthorized actors to perform actions reserved for privileged users without prior authentication.\nThe attack surface is exposed directly through the plugin's interaction with the web server, requiring no interaction from a legitimate administrator to trigger the exploitation.\nSuccessful exploitation could lead to unauthorized data modification, settings manipulation, or event management hijacking depending on the specific administrative endpoints exposed by the plugin.\nOrganizations using this plugin are advised to restrict access to management interfaces until an update is applied and to monitor for suspicious requests targeting the plugin's API or administrative endpoints.",
  "technicalDetails": "The vulnerability originates from a deficiency in the access control implementation within the WP Event Solution plugin (versions <= 4.1.22). Specifically, the plugin fails to perform rigorous nonce verification or session authentication checks on critical internal methods or administrative endpoints.\nIn a secure WordPress environment, administrative or sensitive plugin actions should be wrapped in security checks, such as 'current_user_can()' to verify authorization and nonces to prevent Cross-Site Request Forgery (CSRF). The affected versions lack these checks on key handler functions, effectively exposing them to public requests.\nThe attack flow proceeds as follows: 1. An attacker identifies the exposed administrative endpoint within the WP Event Solution plugin. 2. The attacker crafts an HTTP request (typically GET or POST) targeting the specific endpoint. 3. Because the vulnerable handler fails to validate the user's authentication status or authority, the server processes the request as if it were initiated by an authorized administrator. 4. The plugin performs the requested action, such as modifying event configurations, altering sensitive database entries, or executing administrative tasks that were intended to be restricted.\nThe absence of middleware or guard clauses to enforce authorization leads to a complete bypass of the WordPress authentication layer. The vulnerable component consists of the plugin's backend request handlers where the logic is executed without verifying the 'is_admin()' state or checking the user's role/capability.\nThere are no specific privilege requirements for an attacker, as the vulnerability is exploitable by an unauthenticated user over the network. The payload does not require complex injection techniques but rather relies on the invocation of legitimate functions through unauthorized web requests.\nPost-exploitation impact includes, but is not limited to, the manipulation of event details, unauthorized creation of system records, and potential escalation to further compromise if the exposed functionality allows for file operations or database manipulation. The lack of input validation combined with broken access control provides a direct path for attackers to exercise control over the plugin's core features."
}