CVE-2026-107799 in Jivejdon
Summary
by MITRE • 10/09/2026
Jivejdon through 5.0 contains a stored cross-site scripting vulnerability that allows authenticated attackers to inject script by posting unsanitized forum message bodies. Message bodies are rendered by messageListBody.jsp with filter="false" and non-escaping default filters, executing script in the browser of every user viewing the thread.
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Analysis
by VulDB Data Team • 10/09/2026
The vulnerability identified within Jivejdon versions up through 5.0 represents a critical security flaw classified as a Stored Cross-Site Scripting (XSS) issue. This type of attack is particularly dangerous because it involves persisting malicious code on the target server, ensuring that every user who accesses the compromised content becomes a potential victim without requiring any specific interaction from them beyond viewing the affected page. In this specific instance, the root cause lies in the improper validation and sanitization of input data submitted by authenticated users during forum message creation. When an attacker posts a message containing malicious script payloads, these inputs are stored directly into the application's database or persistent storage without adequate filtering to neutralize executable code components such as JavaScript tags or event handlers.
The technical mechanism facilitating this exploitation is rooted in the server-side rendering logic of the Jivejdon platform. Specifically, the component responsible for displaying forum threads, identified as messageListBody.jsp, operates with a configuration that disables output encoding and applies non-escaping default filters. By setting filter="false", the application explicitly instructs the rendering engine to bypass standard security checks that would normally convert special characters into their HTML entity equivalents. Consequently, when an authenticated user injects script code via unsanitized message bodies, this raw malicious content is written directly into the database and subsequently served back to other users' browsers as executable JavaScript rather than plain text. This lack of context-aware output encoding allows the browser to interpret the injected strings as active web page content rather than data.
The operational impact of this vulnerability extends beyond a single compromised account, affecting all users who view threads containing the malicious payload. Once an attacker successfully injects their script, it executes in the context of every viewer's session within that specific thread. This enables attackers to perform a wide range of hostile actions, including stealing sensitive information such as session cookies or authentication tokens, hijacking user sessions to impersonate legitimate users, defacing web pages, or redirecting victims to malicious external sites designed for phishing or further malware distribution. Because the attack is stored on the server, it does not rely on social engineering tactics like sending a crafted link via email; instead, it passively waits in the forum thread, making detection and mitigation more challenging as the threat persists until the content is manually removed from the database.
From an industry standards perspective, this vulnerability aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific nature of storing malicious scripts in a persistent location categorizes it under Stored XSS, distinguishing it from reflected or DOM-based variants. In terms of the MITRE ATT&CK framework, this attack vector maps to T1059.007, which covers JavaScript execution within web browsers, and potentially T1189 if used for drive-by downloads or further exploitation chains. The persistence mechanism also relates to techniques that allow attackers to maintain access over time by embedding malicious code in legitimate-looking content.
Mitigation strategies must address both the immediate technical flaw and broader security practices. The primary remediation involves implementing strict input validation on all user-supplied data, particularly within forum message bodies, ensuring that only expected character sets are accepted while rejecting or encoding potentially dangerous characters such as angle brackets, quotes, and ampersands. Furthermore, developers must enforce output encoding at the presentation layer by configuring JSP tags to escape HTML entities automatically rather than disabling filters. Enabling Content Security Policy headers can also provide an additional layer of defense by restricting the sources from which scripts are allowed to execute. Organizations running affected versions should immediately upgrade to a patched version where these sanitization and escaping mechanisms are correctly implemented, while simultaneously auditing existing forum content for any residual malicious payloads that may have been injected prior to patching.