CVE-2026-110890 in JetSmartFilters Plugin
Summary
by MITRE • 10/15/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Crocoblock JetSmartFilters jet-smart-filters allows Stored XSS.This issue affects JetSmartFilters: from n/a through 3.8.6.
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Analysis
by VulDB Data Team • 10/15/2026
The identified vulnerability represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this flaw manifests within the Crocoblock JetSmartFilters plugin for WordPress, affecting versions ranging from initial releases up through version 3.8.6. The core technical deficiency lies in the application's failure to adequately sanitize and validate user-supplied input before it is rendered back into the web page context. This lack of proper encoding allows an attacker to inject malicious client-side scripts that are then executed by the browsers of other users who view the affected content, thereby compromising the integrity and confidentiality of the web application environment.
From a technical perspective, this vulnerability is classified as Stored XSS because the injected payload is saved on the target server, typically within a database or file system associated with the plugin's filtering mechanisms. Unlike reflected XSS where malicious scripts are immediately executed in response to a user request, stored XSS persists until retrieved by another user. In the context of JetSmartFilters, this likely occurs when an attacker submits data through filter forms, search inputs, or other interactive elements managed by the plugin. The server processes this input and stores it without applying necessary output encoding such as HTML entity encoding or JavaScript escaping. Consequently, whenever a legitimate visitor loads a page containing these filtered results, their browser interprets the stored script code as part of the document object model, leading to immediate execution within the security context of the website.
The operational impact of this vulnerability is severe and multifaceted. Once executed, the malicious scripts operate with the same privileges as trusted content from the site. This enables attackers to perform session hijacking by stealing authentication cookies or tokens, allowing them to impersonate legitimate users including administrators. It also facilitates credential theft through phishing techniques embedded within the injected interface, such as fake login forms that mimic the original website's design. Furthermore, attackers can manipulate page content, deface websites, redirect traffic to malicious domains for drive-by downloads, or perform actions on behalf of victims if those users have elevated privileges like administrative access. This significantly undermines user trust and exposes sensitive organizational data to unauthorized exposure.
In terms of industry standard classifications, this vulnerability aligns with CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). The specific subtype here is Stored XSS, which falls under the broader category of injection flaws where untrusted data is sent to a web browser without validation or encoding. From an adversary tactics perspective, as defined by the MITRE ATT&CK framework, this vulnerability supports techniques related to Client-side Injection and potentially Account Manipulation if used to escalate privileges after initial access via social engineering facilitated by the XSS payload. The attack vector typically involves remote exploitation with low complexity, requiring only that a victim visits a compromised page or interacts with specific filter elements on the vulnerable site.
Mitigation strategies must address both immediate remediation and long-term security hygiene. The primary solution is to upgrade the JetSmartFilters plugin to version 3.8.7 or later, where Crocoblock has presumably implemented proper input validation and output encoding mechanisms. For organizations unable to patch immediately due to compatibility constraints with other plugins or custom code, a temporary workaround involves implementing server-side filtering rules that strip out script tags and event handlers from user inputs before they are processed by the plugin. Additionally, deploying a Web Application Firewall can help detect and block common XSS payloads in HTTP requests targeting vulnerable endpoints.
Long-term resilience requires adopting secure coding practices such as Content Security Policy implementation to restrict the sources from which scripts can be loaded, thereby mitigating the impact even if an injection occurs. Developers should enforce strict type checking on all inputs and utilize context-aware encoding libraries that automatically handle HTML, JavaScript, CSS, or URL contexts appropriately. Regular security audits and penetration testing focused on input validation flaws are essential to identify similar weaknesses in other components of the WordPress ecosystem before they can be exploited by malicious actors seeking to compromise web applications through stored script injection vectors.