CVE-2026-110625 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/flagged_item.php via the unencoded type GET parameter. Attackers can send crafted flagged_item.php?type= links to logged-in administrators or moderators to execute injected 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, specifically targeting the flagged_item.php endpoint via the type GET parameter. This flaw arises from insufficient input validation and output encoding mechanisms when processing user-supplied data in an administrative context. The application fails to properly sanitize or encode the value passed through the type parameter before rendering it back into the HTML response without adequate protection against script execution. Consequently, this allows for the injection of malicious client-side scripts that are executed within the browser session of authenticated administrators or moderators who view the manipulated URL.
The technical nature of this vulnerability aligns with CWE-79, which classifies improper neutralization of input during web page generation as a cross-site scripting weakness. The attack vector is classified under ATT&CK technique T1059.007, representing command and script interpretation through browser-based execution via HTML injection. Because the reflection occurs in an administrative area rather than on public-facing pages, the impact is significantly more severe than typical user-targeted XSS attacks. An attacker can craft a malicious link containing encoded JavaScript payloads within the type parameter and distribute it to privileged users through social engineering tactics such as phishing emails or deceptive messages. When an administrator clicks this link while logged into the ClipBucket admin panel, their browser will execute the injected script in the context of that trusted domain.
The operational impact of exploiting this vulnerability is substantial due to the elevated privileges associated with administrative accounts. Successful exploitation enables attackers to perform actions on behalf of the victim user, including but not limited to stealing session cookies, hijacking active sessions, modifying content settings, or accessing sensitive system configurations. In many web applications, admin panels have access to database credentials, file management systems, and user data repositories. Therefore, compromising an administrative account through XSS can serve as a pivot point for further lateral movement within the infrastructure. Attackers may also use this vector to deface the website by altering displayed content or redirecting users to malicious sites designed to harvest additional credentials or distribute malware.
Mitigation strategies should focus on implementing strict input validation and robust output encoding practices across all administrative endpoints. Developers must ensure that any data retrieved from GET parameters is properly encoded using context-aware methods before being inserted into HTML responses, thereby neutralizing special characters that could be interpreted as executable code. Additionally, deploying a Web Application Firewall can provide an additional layer of defense by detecting and blocking known XSS patterns in HTTP requests. Enforcing secure session management practices such as HttpOnly flags on cookies and implementing Content Security Policy headers can further limit the impact if exploitation occurs. Regular security audits and penetration testing focused on administrative interfaces are recommended to identify similar vulnerabilities before they can be exploited in production environments.