CVE-2026-110627 in ClipBucket
Summary
by MITRE • 10/15/2026
ClipBucket v5 through 5.5.3-#206 contains a reflected cross-site scripting vulnerability in admin_area/index.php that allows attackers to inject HTML via the val parameter in mode=add_todo. Attackers can lure a logged-in administrator into submitting a cross-site POST form without CSRF protection, executing script in the admin panel origin.
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Analysis
by VulDB Data Team • 10/15/2026
The identified security flaw resides within ClipBucket versions 5 through 5.5.3-#206 and is classified as a reflected Cross-Site Scripting vulnerability located specifically in the administrative interface file index.php. This vulnerability arises from insufficient input validation and sanitization of user-supplied data, particularly when handling the val parameter during operations involving mode=add_todo. The core technical deficiency lies in the application's failure to properly encode or escape special characters before rendering them back into the HTML response context. Consequently, an attacker can craft a malicious payload containing executable JavaScript code within this parameter value. When the administrative interface processes this input without adequate filtering, it reflects the untrusted data directly into the page output, allowing for the injection of arbitrary client-side scripts that execute in the browser session of any user viewing the affected page.
The operational impact of this vulnerability is significantly amplified by its location within the admin panel and the absence of Cross-Site Request Forgery protections on the relevant form submission mechanism. Because the administrative interface typically grants elevated privileges, successful exploitation allows an attacker to perform actions with the authority level of a logged-in administrator. The lack of CSRF tokens or similar anti-forgery measures means that attackers can lure administrators into submitting specially crafted POST requests via social engineering tactics, such as embedding malicious forms in external websites or sending deceptive links through email or messaging platforms. Once triggered, these requests execute within the context of the admin's active session, bypassing standard authentication checks for subsequent actions and enabling persistent compromise if stored scripts are injected alongside reflected ones.
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 the reflection of user input without proper sanitization, fitting the profile of Reflected XSS where the malicious script is part of the initial HTTP request and immediately returned in the response. Furthermore, this attack vector maps to MITRE ATT&CK technique T1059, specifically sub-technique 007 for JavaScript execution under Command and Scripting Interpreter. The exploitation strategy leverages social engineering to induce privilege escalation through session hijacking or direct administrative action abuse, which correlates with techniques involving browser-based credential access and unauthorized configuration changes within the application environment.
Mitigation strategies must address both the immediate code-level flaws and broader architectural weaknesses. Developers should implement strict input validation on all parameters received by admin_area/index.php, ensuring that only expected data types are accepted for fields like val in add_todo operations. Output encoding is critical; any user-supplied data rendered back into HTML responses must be properly encoded using context-aware methods to prevent script interpretation. Additionally, the application must enforce robust Cross-Site Request Forgery protections by implementing unique per-session tokens on all state-changing POST requests within the administrative interface. These tokens should be validated server-side before processing any modification or addition operations. Regular security audits and static code analysis tools configured to detect XSS patterns can help identify similar vulnerabilities across other modules of the ClipBucket platform, ensuring comprehensive protection against client-side injection attacks in privileged areas.