CVE-2026-116398 in Content Slider Block Plugin
Summary
by MITRE • 10/26/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in bPlugins Content Slider Block content-slider-block allows Stored XSS.This issue affects Content Slider Block: from n/a through 3.2.1.
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Analysis
by VulDB Data Team • 10/26/2026
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 bPlugins Content Slider Block plugin for WordPress environments. The affected versions span from an unspecified initial release through version 3.2.1. Unlike reflected XSS attacks where malicious scripts are executed via manipulated URLs in real-time during user interaction, stored vulnerabilities involve the persistence of malicious payloads on the target server. In this context, the application fails to adequately sanitize or validate input data before storing it within its database or file system for later retrieval and display. This architectural oversight allows an attacker to inject executable JavaScript code that becomes permanently embedded in the content managed by the plugin.
The technical mechanism behind this vulnerability lies in the insufficient filtering of user-supplied data during the creation or modification of slider blocks. When a user, potentially with administrative privileges or any role capable of adding new sliders depending on the specific configuration and default WordPress capabilities, inputs malicious script tags into fields such as titles, descriptions, or custom HTML attributes within the Content Slider Block interface, the application accepts this input without applying appropriate neutralization techniques. These techniques typically include context-aware encoding, escaping special characters like angle brackets and quotes, or utilizing a whitelist approach for allowed HTML elements. By bypassing these safeguards, the malicious payload is saved directly to the backend storage associated with that specific slider block configuration.
The operational impact of this stored XSS vulnerability is significant because it affects every user who views the affected web page containing the compromised content slider. Once an administrator or authorized editor injects the script, it remains active on the server until manually removed by a developer or site owner. Consequently, any visitor accessing the webpage where the Content Slider Block is rendered will have their browser execute the injected JavaScript code in the context of the vulnerable website. This execution environment grants the attacker access to sensitive information such as session cookies, authentication tokens, and local storage data associated with the current domain. The victim user remains unaware that their browser has been compromised during this interaction, leading to potential account takeover scenarios if multi-factor authentication is not enforced or if session fixation techniques are employed alongside the XSS payload.
From a threat modeling perspective aligned with industry standards, this vulnerability maps directly to CWE-79: Improper Neutralization of Input During Web Page Generation (Cross-site Scripting). The specific variant here aligns with Stored Cross-Site Scripting, which is often categorized under OWASP Top 10 as A3:2021-Injection or historically as XSS. In terms of the MITRE ATT&CK framework for web applications, this flaw facilitates techniques related to Client-side Injection and potentially Credential Access if used in conjunction with phishing pages hosted on the same domain. The persistence aspect elevates the severity compared to reflected variants because it does not require complex social engineering tricks like sending malicious links via email; simply visiting a page where an admin previously posted content is sufficient for exploitation, increasing the likelihood of successful compromise across multiple users over time.
Mitigation strategies must address both immediate remediation and long-term defensive coding practices. The most effective solution is to upgrade the bPlugins Content Slider Block plugin to a version later than 3.2.1 where this vulnerability has been patched by the developers through proper input validation and output encoding mechanisms. If upgrading is not immediately feasible, temporary workarounds include restricting who can create or edit content sliders to only highly trusted administrators with strong password hygiene and multi-factor authentication enabled. Additionally, implementing a Web Application Firewall WAF rule that detects and blocks common XSS payloads in POST requests related to slider creation could provide an additional layer of defense. It is also advisable to review the site for any existing injected scripts by auditing database entries associated with slider content fields to ensure no malicious code remains stored after patching. Regular security audits and adherence to secure coding guidelines such as those outlined in OWASP Secure Coding Practices will help prevent similar injection flaws in future development cycles.