CVE-2026-110626 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/language_settings.php via the unencoded edit_language GET parameter. Attackers can send administrators with basic_settings permission a crafted link whose payload is echoed into a hidden input, executing script in the admin panel origin.
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Analysis
by VulDB Data Team • 10/15/2026
ClipBucket versions 5 through 5.5.3-#206 are susceptible to a reflected cross-site scripting vulnerability located within the administrative interface component language_settings.php. This security flaw arises from insufficient sanitization and encoding of user-supplied input, specifically targeting the edit_language GET parameter. When an administrator with basic_settings permissions accesses this endpoint, the application fails to properly validate or escape the data provided in the query string before processing it for display. Consequently, any malicious script content embedded within the URL parameters is directly reflected back into the HTTP response without adequate transformation, allowing client-side code execution under the context of the administrative panel.
The technical mechanism of this vulnerability relies on the application echoing the unencoded edit_language parameter value into a hidden HTML input field. While hidden inputs are not visually rendered to the user in standard browsing contexts, they remain part of the Document Object Model and can be manipulated by JavaScript running within that same origin context. By crafting a malicious URL containing executable script payloads, an attacker can trigger this reflection when the target administrator loads the page. Because the execution occurs within the admin_area domain, the injected scripts inherit the full privileges associated with the administrative session, including access to sensitive configuration settings and user management tools.
From an operational perspective, the impact of this vulnerability is significant due to its location within the administration panel. Successful exploitation allows attackers to perform actions on behalf of the authenticated administrator without their knowledge or consent. This can lead to complete compromise of the ClipBucket platform, enabling data exfiltration, defacement, installation of web shells, or further lateral movement into internal network segments if administrative credentials provide access to broader infrastructure. The requirement for basic_settings permission limits the attack surface slightly but still encompasses a wide range of users who manage site localization and language configurations, making it a viable vector for targeted attacks against content management administrators.
This vulnerability is classified under CWE-79 Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting or XSS. Specifically, it represents a reflected variant where the malicious payload is sent via HTTP request parameters rather than stored in backend databases. In terms of offensive security frameworks such as MITRE ATT&CK, this technique aligns with T1059 Command and Scripting Interpreter execution within a browser context and potentially contributes to T1204 User Execution if social engineering techniques are employed to lure administrators into clicking the crafted link. The lack of output encoding is the primary root cause, indicating that input validation alone is insufficient; robust output encoding must be applied consistently across all dynamic content generation points in the application logic.
Mitigation strategies should prioritize immediate patching to version 5.5.3-#207 or later where this issue has been addressed by developers implementing proper escaping mechanisms for GET parameters before insertion into HTML attributes. In addition to software updates, administrators can implement web application firewall rules that detect and block common XSS payload patterns within URL query strings targeting the language_settings endpoint. Input validation should be enforced to restrict allowed characters in the edit_language parameter to alphanumeric values only, rejecting any input containing special symbols or script tags. Furthermore, enabling strict Content Security Policy headers with a nonce-based approach can mitigate the impact of successful injection attempts by restricting inline script execution unless explicitly authorized by server-generated tokens.