CVE-2026-101159 in WP Ultimate Review Plugin
Summary
by MITRE • 10/03/2026
The WP Ultimate Review WordPress plugin before 2.4.4 does not properly sanitise and escape reviews submitted through its public review form, which is available to unauthenticated visitors, allowing them to perform Stored Cross-Site Scripting attacks against any user, including administrators, viewing a page displaying the review, when user reviews are enabled.
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Analysis
by VulDB Data Team • 10/03/2026
The vulnerability identified in WP Ultimate Review versions prior to 2.4.4 represents a critical security flaw rooted in insufficient input validation and output encoding mechanisms within the plugin's public-facing interface. This specific weakness allows unauthenticated users to inject malicious script payloads into review submissions that are subsequently stored on the server without proper sanitization or escaping. Because the vulnerability affects data that is rendered back to other visitors, it creates a persistent threat vector where any user accessing a page containing these tainted reviews becomes a potential victim of cross-site scripting attacks. The lack of adequate filtering for special characters and script tags in the review submission form means that attackers can bypass standard browser security checks by embedding executable JavaScript code directly into the content fields intended for text-only input.
From a technical perspective, this flaw is classified under CWE-79, which denotes Improper Neutralization of Input During Web Page Generation commonly known as Cross-Site Scripting (XSS). The root cause lies in the application's failure to apply context-appropriate encoding when rendering user-generated content and its simultaneous failure to validate input against a whitelist of safe characters during ingestion. This dual failure enables stored XSS, where the malicious payload is saved on the target server rather than being executed solely through a crafted link as seen in reflected XSS scenarios. The persistence of this data means that every time an administrator or regular user views the affected page, their browser executes the injected script within the security context of the WordPress site, effectively granting the attacker control over the victim's session and interaction with the application.
The operational impact of this vulnerability is severe due to its potential for privilege escalation and widespread compromise. Since administrators are not exempt from viewing pages containing reviews, an attacker can target high-privilege accounts specifically. Successful exploitation allows the adversary to steal administrative cookies or authentication tokens, hijack active sessions, perform actions on behalf of the victim such as modifying site settings or creating new admin users, and deface the website's appearance by injecting malicious HTML content. In enterprise environments running WordPress, this can lead to broader network compromise if session tokens are reused across other services or if the compromised account is used to upload further malware payloads through the administrative dashboard.
This vulnerability aligns with several tactics in the MITRE ATT&CK framework for web applications. It corresponds primarily to Initial Access via Exploitation of Remote Services and Execution through Browser Scripting, specifically leveraging techniques associated with Client-Side Code Injection. The persistence aspect also touches upon Persistence mechanisms where malicious scripts may attempt to maintain access or exfiltrate data over time. Understanding these mappings helps security teams prioritize remediation efforts based on the broader threat landscape and potential attack chains that could be constructed using this initial foothold within the WordPress ecosystem.
Mitigation strategies must focus immediately on updating the WP Ultimate Review plugin to version 2.4.4 or later, where the developers have implemented proper input sanitization and output escaping procedures. Until an update is applied, administrators should consider disabling user reviews entirely if they are not essential for their specific use case, thereby removing the attack surface associated with unauthenticated submission forms. Additionally, implementing a Web Application Firewall can provide a layer of defense by filtering out requests containing known malicious script patterns before they reach the application logic. Long-term remediation involves adopting secure coding practices that enforce strict type checking and context-aware encoding for all user-supplied data to prevent similar injection vulnerabilities in future development cycles.