CVE-2026-39730 in Wise Chat Plugin
Summary
by MITRE • 10/06/2026
Missing Authorization vulnerability in Marcin Wise Chat wise-chat allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Wise Chat: from n/a through 3.4.2.
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Analysis
by VulDB Data Team • 10/06/2026
The identified vulnerability represents a critical failure in access control mechanisms within the Marcin Wise Chat plugin, specifically affecting versions ranging from initial releases up to version 3.4.2. This flaw is categorized as an Incorrectly Configured Access Control Security Level issue, which fundamentally undermines the integrity of user permissions and data isolation strategies employed by the application. In web applications that facilitate real-time communication or chat functionalities, maintaining strict separation between administrative privileges and standard user roles is paramount for ensuring system security. The absence of proper authorization checks allows attackers to bypass intended restrictions, effectively granting them access to functions or data resources they should not be able to reach under normal operational conditions.
From a technical perspective, this vulnerability stems from the application's failure to validate whether the authenticated user possesses the necessary permissions before executing sensitive actions. When a request is made to perform an administrative task or access restricted chat logs and settings, the server-side logic does not adequately verify the role associated with the session token or cookie. This oversight creates a path for unauthorized actors to manipulate requests directly, often through simple HTTP parameter tampering or by crafting specific API calls that bypass frontend-enforced restrictions. The root cause lies in the lack of robust backend authorization middleware that consistently checks user roles against required access levels for every protected endpoint.
The operational impact of this vulnerability is severe, as it can lead to a complete compromise of the chat environment and potentially the underlying WordPress installation if privilege escalation occurs. An attacker with low-privileged credentials could escalate their rights to administrator level, allowing them to modify site configurations, inject malicious scripts into chat messages, or exfiltrate sensitive user data stored within the chat history. This not only violates confidentiality but also compromises integrity by enabling unauthorized modifications to system settings and content. Furthermore, such access can be leveraged as a foothold for further attacks against other users interacting with the compromised chat interface, facilitating cross-site scripting campaigns or social engineering efforts disguised as legitimate administrative communications.
This issue aligns closely with CWE-269, which describes Improper Privilege Control, where an actor is able to elevate privileges beyond what was intended by the system designers. Additionally, it maps to MITRE ATT&CK technique T1078, Valid Accounts, specifically in the context of using legitimate credentials to access resources that are not authorized for their account type. The vulnerability highlights a common weakness in plugin development where frontend security measures are mistakenly assumed to be sufficient without corresponding backend enforcement mechanisms.
To mitigate this risk, immediate action is required by upgrading the Marcin Wise Chat plugin to version 3.4.3 or later, which includes patches addressing these authorization flaws. Administrators should also implement strict input validation and ensure that all administrative endpoints enforce server-side role verification regardless of client-side restrictions. Regular security audits focusing on access control logic are recommended to identify similar gaps in other plugins or custom code. Additionally, employing a Web Application Firewall can provide an additional layer of defense by detecting and blocking anomalous requests that attempt to exploit missing authorization checks, although this should be viewed as a compensatory measure rather than a primary fix for the underlying architectural deficiency.