CVE-2023-2399 in QuBot Plugin
Summary
by MITRE • 06/19/2023
The QuBot WordPress plugin before 1.1.6 doesn't filter user input on chat, leading to bad code inserted on it be reflected on the user dashboard.
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Analysis
by VulDB Data Team • 04/25/2025
The QuBot WordPress plugin vulnerability represents a critical cross-site scripting flaw that emerged in versions prior to 1.1.6, exposing WordPress installations to significant security risks. This vulnerability stems from inadequate input validation and sanitization mechanisms within the plugin's chat functionality, creating an avenue for malicious actors to inject and execute arbitrary code within user dashboards. The flaw specifically affects the plugin's handling of user-provided chat messages, where insufficient filtering allows potentially harmful content to be stored and subsequently reflected back to users without proper sanitization.
The technical nature of this vulnerability aligns with CWE-79, which categorizes cross-site scripting as a common web application security weakness. The flaw operates by permitting unfiltered user input to be directly embedded into the dashboard interface, enabling attackers to craft malicious payloads that execute in the context of authenticated users. This creates a persistent threat vector where injected code can manipulate user sessions, steal credentials, or perform unauthorized actions within the WordPress administration environment. The reflected nature of the vulnerability means that malicious input is immediately processed and displayed back to users, amplifying the impact of the attack.
From an operational perspective, this vulnerability poses severe risks to WordPress site administrators and users who interact with the QuBot plugin. Attackers can exploit the flaw to inject malicious scripts that persist in the user dashboard, potentially leading to account takeover, data exfiltration, or further compromise of the WordPress installation. The vulnerability's impact extends beyond simple script injection, as it can be leveraged to establish backdoors or facilitate more sophisticated attacks such as privilege escalation. Given that the plugin operates within the WordPress ecosystem, successful exploitation could potentially compromise the entire site if attackers gain elevated privileges through the dashboard manipulation.
The remediation strategy for this vulnerability requires immediate deployment of the patched version 1.1.6, which implements proper input sanitization and output encoding mechanisms. Security teams should conduct comprehensive audits of all installed plugins to identify similar vulnerabilities, particularly those handling user input in dashboard contexts. The mitigation approach should incorporate input validation at multiple layers, including client-side and server-side filtering, to prevent malicious code injection. Organizations should also implement web application firewalls and monitoring systems to detect anomalous user input patterns. This vulnerability demonstrates the critical importance of regular security updates and the necessity of maintaining up-to-date security practices within WordPress environments, as highlighted by ATT&CK techniques related to credential access and privilege escalation through web application vulnerabilities.