CVE-2026-122665 in Mang Board Plugin
Summary
by MITRE • 11/09/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kitae Park Mang Board WP mangboard allows Stored XSS.This issue affects Mang Board WP: from n/a through 2.4.7.
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Analysis
by VulDB Data Team • 11/09/2026
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 Mang Board WP plugin for WordPress, developed by Kitae Park. Unlike reflected XSS attacks where malicious scripts are executed immediately upon user interaction with a crafted link, stored vulnerabilities persist on the target server. In this context, the application fails to adequately sanitize or validate user-supplied input before storing it in its backend database and subsequently rendering it back into web pages without proper encoding. This architectural oversight allows an attacker to inject client-side scripts that will be executed by any victim who views the affected page where the malicious content is displayed.
The technical root cause lies in the insufficient filtering of special characters such as angle brackets, quotes, and ampersands within input fields managed by the plugin. When a user submits data containing executable JavaScript code, the application accepts this payload without applying necessary output encoding or context-aware escaping mechanisms. Consequently, when another user accesses the page where this content is rendered, their browser interprets the injected script as legitimate code originating from the trusted domain of the WordPress site. This bypasses same-origin policy protections and grants the attacker a high degree of control over the victim's browsing session within the context of the vulnerable application.
The operational impact of this vulnerability is severe due to its persistent nature. An attacker does not need to trick users into clicking specific links; rather, they can post malicious content in forums, comments, or other user-generated sections managed by Mang Board WP. Once stored, every subsequent visitor to that page becomes a potential victim. This facilitates the theft of sensitive information such as session cookies, authentication tokens, and personal data entered on the site. Furthermore, attackers can leverage this access to perform actions on behalf of authenticated users, potentially leading to administrative privilege escalation if an administrator views the malicious content. The attack vector aligns with CWE-79, which categorizes improper neutralization of input during web page generation as a critical weakness in software security design and implementation.
From a threat intelligence perspective, this vulnerability maps directly to the MITRE ATT&CK technique T1059.007, specifically JavaScript execution within browser environments. It also relates to TA0005, Defense Evasion, if used to bypass content security policies or hide malicious activities from administrators by manipulating page rendering. The persistence of the payload means that remediation requires not only patching the code but also auditing existing database entries for any previously injected malicious scripts to ensure complete removal and prevention of ongoing compromise.
Mitigation strategies must focus on both immediate remediation and long-term defensive coding practices. Administrators should immediately update Mang Board WP to version 2.4.8 or later, where these input validation issues have been addressed by the developer. For systems unable to upgrade instantly, implementing a Web Application Firewall can provide temporary protection by filtering out known malicious payloads before they reach the application logic. Additionally, developers must enforce strict output encoding based on the context in which data is rendered, such as HTML entity encoding for body content or attribute escaping for dynamic attributes. Adopting Content Security Policy headers can further mitigate the impact of successful XSS attacks by restricting the sources from which scripts are allowed to execute, thereby reducing the effectiveness of injected payloads even if input validation fails.