CVE-2026-116400 in Button Block Plugin
Summary
by MITRE • 10/26/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in bPlugins Button Block button-block allows Stored XSS.This issue affects Button Block: from n/a through 1.2.7.
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Analysis
by VulDB Data Team • 10/26/2026
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 is located within the bPlugins Button Block component, affecting versions from n/a through 1.2.7. The core technical issue stems from insufficient validation and sanitization of user-supplied input before it is rendered in a web page context. When an attacker injects malicious script payloads into fields managed by the button block functionality, these inputs are stored on the server without proper encoding or escaping mechanisms to neutralize their executable nature. Consequently, when other users subsequently access pages containing this data, the browser interprets the injected scripts as legitimate code rather than static content, leading to unintended execution within the user's session context.
This specific implementation is classified as a Stored XSS vulnerability because the malicious payload persists on the target server, typically in a database or file system associated with the button block configuration. Unlike reflected XSS where the attack vector is contained within a single HTTP request and response cycle, stored XSS ensures that every victim who views the affected page will trigger the execution of the attacker's script. This persistence significantly amplifies the potential impact, as it does not require complex social engineering to trick users into clicking specific links; rather, mere access to the compromised content is sufficient for exploitation. The vulnerability aligns with CWE-79, which defines Cross-site Scripting (XSS) errors in web applications due to inadequate input validation and output encoding.
The operational impact of this vulnerability is severe, primarily revolving around session hijacking, credential theft, and defacement. An attacker can exploit the stored script to execute arbitrary JavaScript commands within the context of the victim's browser session. This allows the extraction of sensitive cookies containing authentication tokens or session identifiers, which can then be used by the attacker to impersonate legitimate users. Furthermore, the vulnerability enables attackers to perform actions on behalf of victims, such as modifying account settings, making unauthorized transactions, or manipulating data within the application interface. In environments where administrative privileges are involved, this could lead to full system compromise, allowing for further lateral movement and deeper infiltration into the underlying infrastructure.
From a threat intelligence perspective, this vulnerability maps directly to MITRE ATT&CK technique T1059.007, which covers JavaScript execution in web browsers as part of Command and Control or Collection phases. The persistence mechanism inherent in stored XSS also aligns with techniques related to maintaining access through compromised accounts or injected content that survives system reboots or session expirations if the attacker's script is designed to persistently log activity or maintain a backdoor connection. Security teams should recognize this not merely as an input validation error but as a critical pathway for persistent unauthorized access and data exfiltration within web-based applications utilizing vulnerable components like bPlugins Button Block.
Mitigation strategies must focus on both immediate remediation and long-term defensive coding practices. The most effective solution is to upgrade the affected software component, specifically updating the bPlugins Button Block to version 1.2.8 or later where this issue has been resolved by implementing robust input sanitization and output encoding protocols. For organizations unable to immediately patch due to compatibility constraints, temporary mitigations include deploying a Web Application Firewall configured with rulesets capable of detecting and blocking common XSS payloads in HTTP requests targeting the button block endpoints. Additionally, enforcing Content Security Policy headers can help mitigate the impact by restricting the sources from which scripts are allowed to execute, thereby preventing the injected malicious code from running even if it is successfully stored on the server. Regular security audits and static application security testing should be integrated into the development lifecycle to prevent similar input handling flaws in future releases.