CVE-2026-84847 in Quick Event Manager Plugin
Summary
by MITRE • 09/03/2026
Unauthenticated Broken Access Control in Quick Event Manager <= 9.17 versions.
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Analysis
by VulDB Data Team • 09/03/2026
The vulnerability identified as an unbroken access control flaw within Quick Event Manager versions up to and including 9.17 represents a critical failure in the application's security architecture, specifically concerning authentication mechanisms. This issue allows any remote attacker who can reach the web server hosting the application to perform administrative actions without providing valid credentials. The core of this vulnerability lies in the improper enforcement of access control policies on specific endpoints or functions that are intended to be restricted to authenticated administrators only. Instead of verifying user session validity and permissions before processing requests, the software fails to implement adequate checks, effectively leaving these sensitive operations exposed to the public internet. This type of flaw is a classic example of broken access control, where the application does not properly restrict interactions between authorized users and resources they are permitted to access.
From a technical perspective, this vulnerability typically manifests through specific API endpoints or administrative pages that lack proper session validation middleware. An attacker can craft HTTP requests targeting these unprotected routes directly, bypassing the login interface entirely. The absence of authentication checks means that actions such as creating new user accounts with elevated privileges, modifying system configurations, deleting event data, or executing arbitrary commands on the underlying server can be performed by an unauthenticated entity. This is particularly dangerous because it does not require any prior compromise of a valid user account, making it highly exploitable for automated attacks and widespread exploitation across vulnerable deployments. The flaw aligns directly with CWE-284, which describes Improper Access Control, where the application fails to enforce proper authorization checks on critical functions.
The operational impact of this vulnerability is severe and multifaceted. Attackers can achieve full administrative control over the Quick Event Manager instance, leading to a complete compromise of data integrity and confidentiality. Sensitive event information, attendee details, payment records, and other proprietary business data stored within the application become accessible to unauthorized parties. Furthermore, depending on how the backend processes these requests, this access could potentially lead to remote code execution if the administrative functions allow for file uploads or system command invocations that are not properly sanitized. This transforms a simple information disclosure issue into a potential server takeover scenario, allowing attackers to use the compromised host as a pivot point for further network intrusion. The ability to create new administrator accounts also ensures persistent access, even if initial entry points are patched or discovered by security teams.
In terms of threat modeling and industry frameworks, this vulnerability maps closely to several techniques within the MITRE ATT&CK framework. It facilitates Initial Access through exploitation of public-facing applications with insufficient authentication controls. Once inside, the attacker can perform Credential Dumping or Account Manipulation by creating new privileged accounts without detection from standard monitoring tools that rely on login event logs for anomaly detection. The lack of proper access control also enables Privilege Escalation, as a low-privileged or unauthenticated actor gains high-level permissions immediately upon exploitation. This aligns with the broader category of Broken Access Control attacks which are consistently ranked among the top security risks in modern web applications according to OWASP guidelines.
Mitigation strategies must focus on immediate remediation and long-term architectural improvements. The primary and most effective solution is to upgrade Quick Event Manager to a version newer than 9.17, where this specific access control flaw has been addressed by the vendor through proper implementation of authentication checks for all administrative endpoints. For organizations unable to patch immediately due to operational constraints, network-level controls such as Web Application Firewalls can be configured to block requests targeting known vulnerable paths or requiring valid session tokens for administrative URLs. Additionally, implementing strict input validation and ensuring that all sensitive functions require multi-factor authentication can reduce the risk of exploitation. Regular security audits focusing on access control logic are essential to prevent similar flaws in future development cycles, ensuring that every endpoint is explicitly secured against unauthenticated access by default rather than relying on implicit trust mechanisms.