CVE-2026-118087 in Site Reviews Plugin
Summary
by MITRE • 10/29/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Gemini Labs Site Reviews site-reviews allows Stored XSS.This issue affects Site Reviews: from n/a through 8.3.5.
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Analysis
by VulDB Data Team • 10/29/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this vulnerability manifests as a Stored XSS within the Gemini Labs Site Reviews plugin for WordPress, affecting versions ranging from initial releases up through version 8.3.5. Unlike reflected XSS where malicious scripts are executed via manipulated URLs, stored vulnerabilities persist on the target server because user-supplied input is saved in a database or other persistent storage mechanism without adequate sanitization. In this context, an attacker can inject malicious JavaScript code into fields intended for review submissions, ratings, or comments within the Site Reviews plugin interface. Once submitted, this payload is not properly escaped before being rendered to subsequent visitors viewing those reviews, leading to automatic execution of the script in their browsers.
From a technical perspective, the root cause lies in insufficient validation and encoding of user input during the rendering phase of web page generation. When the application constructs HTML content dynamically using data retrieved from its database, it fails to apply appropriate output encoding such as HTML entity encoding or context-aware escaping for JavaScript contexts. This oversight allows special characters like angle brackets, quotes, and ampersands to be interpreted by the browser's parser as executable code rather than literal text. The vulnerability is particularly severe because it does not require complex social engineering tactics beyond convincing a user to submit malicious content through the legitimate interface of the plugin. Furthermore, since the payload is stored server-side, every user who views the affected page becomes a potential victim without needing any direct interaction with the attacker after the initial injection.
The operational impact of this vulnerability extends significantly beyond simple script execution. An attacker leveraging this Stored XSS can perform session hijacking by stealing authentication cookies or tokens associated with active user sessions, potentially leading to unauthorized access as an administrator if they target privileged accounts. Additionally, the malicious code can facilitate keylogging, capturing sensitive information such as passwords and credit card numbers entered on the site. It may also be used to deface the website's appearance, redirect users to phishing sites designed to mimic legitimate login pages, or distribute malware by downloading exploits from remote servers hosted by the attacker. The persistence of this threat means that remediation requires not only patching the software but also cleaning any existing malicious scripts already stored in the database for previously submitted reviews.
This vulnerability aligns with CWE-79, which defines Improper Neutralization of Input During Web Page Generation: Cross-site Scripting (XSS). In terms of offensive security frameworks, it maps to MITRE ATT&CK technique T1059, specifically sub-technique 007 for JavaScript. The attack vector typically involves the Initial Access phase where the attacker injects code via a legitimate input field, followed by Execution as the script runs in the victim's browser context. To mitigate this risk, immediate action is required to update the Site Reviews plugin to version 8.3.6 or later, which addresses these sanitization failures. Administrators should also implement Web Application Firewalls that can detect and block common XSS payloads in HTTP requests. Furthermore, adopting Content Security Policy headers can help restrict the sources from which scripts are allowed to execute, thereby reducing the impact even if a vulnerability is exploited. Regular security audits and input validation practices at both client and server sides are essential for preventing similar issues in future development cycles.