CVE-2026-107798 in jivejdon
Summary
by MITRE • 10/09/2026
jivejdon from commit 595d8d22 through commit ee67a65e contains a stored cross-site scripting vulnerability in the default-enabled TextStyle filter that inserts unvalidated URLs into anchor href attributes. Authenticated attackers can post messages with javascript: links or quote-breaking URLs to execute JavaScript when other users click or hover over rendered links.
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Analysis
by VulDB Data Team • 10/09/2026
The identified security flaw resides within the JiveJDon component, specifically affecting code versions ranging from commit 595d8d22 through ee67a65e. This vulnerability is classified as a stored cross-site scripting issue rooted in the default-enabled TextStyle filter mechanism. The core technical deficiency lies in the insufficient validation and sanitization of user-supplied input when it is processed for display within anchor href attributes. Instead of strictly allowing only safe protocols such as HTTP or HTTPS, the application fails to adequately restrict other URI schemes, thereby permitting the injection of malicious JavaScript code directly into the hyperlink structure. This lack of rigorous output encoding allows an attacker to embed executable scripts that are persisted on the server side rather than being transient in a single request.
The operational impact of this vulnerability is significant because it enables authenticated attackers to craft and post messages containing javascript: links or URLs designed to break out of standard quoting mechanisms. Once these malicious posts are published, they remain stored within the application's database until manually removed by an administrator. Consequently, any other user who views the compromised content and interacts with the rendered link, either through a click or even a hover event depending on browser implementation details, will trigger the execution of arbitrary JavaScript code in their own security context. This persistence distinguishes it from reflected XSS attacks, as the payload does not require complex social engineering to deliver via external links; simply visiting the affected page is sufficient for exploitation, leading to potential session hijacking, credential theft, or defacement depending on the capabilities of the injected script and the privileges of the victim user.
From a classification 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 mechanism involves failing to validate input against a whitelist of safe protocols before embedding it in HTML attributes, falling under CWE-830: Inclusion of Functionality from Untrusted Control Sources when considering the broader context of script execution. Furthermore, within the MITRE ATT&CK framework, this behavior maps to T1189 Drive-by Client-Side Script Injection and potentially T1566.001 Phishing: Spearphishing Link if used in targeted campaigns, although the stored nature makes it more akin to a persistent web application attack vector rather than purely phishing-based delivery. The use of javascript: URIs is a classic technique for bypassing basic content security policies that might otherwise restrict script execution from external domains.
To mitigate this vulnerability, immediate remediation should focus on implementing strict allow-list validation for all URL schemes processed by the TextStyle filter. Developers must ensure that only standard web protocols such as http and https are permitted in href attributes, explicitly rejecting or encoding any attempt to use javascript:, vbscript:, data: with executable payloads, or other potentially dangerous URI schemes. Additionally, applying context-aware output encoding is essential; even if input validation is robust, encoding special characters like angle brackets and quotes during the rendering phase provides a defense-in-depth layer against unexpected parsing behaviors in various browsers. It is also advisable to review the default configuration of the TextStyle filter to ensure that such permissive settings are not enabled by default for all user roles, particularly restricting these capabilities to trusted administrators if necessary. Regular security audits and static code analysis focused on input validation patterns can help prevent similar issues from being introduced into other parts of the application logic in future development cycles.