CVE-2026-62100 in KuteShop Plugin
Summary
by MITRE • 10/10/2026
Unauthenticated Cross Site Scripting (XSS) in KuteShop <= 4.2.9 versions.
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Analysis
by VulDB Data Team • 10/10/2026
The vulnerability identified as an unauthenticated cross-site scripting flaw within KuteShop versions prior to or equal to 4.2.9 represents a critical security deficiency that allows attackers to inject malicious client-side scripts into web pages viewed by other users. This specific type of injection occurs because the application fails to properly validate, sanitize, or encode user-supplied input before including it in dynamic content generation processes. Unlike authenticated vulnerabilities which require an attacker to have valid credentials and often a higher privilege level, this unauthenticated variant can be exploited by any remote actor with network access to the target web server, significantly lowering the barrier for entry and increasing the potential attack surface considerably.
From a technical perspective, the root cause lies in the inadequate handling of input data within specific endpoints or form fields processed by the KuteShop platform. When user inputs are reflected back into the HTML response without appropriate encoding mechanisms such as HTML entity encoding or context-aware escaping, the browser interprets the injected script tags as executable code rather than plain text. This behavior aligns with Common Weakness Enumeration identifier CWE-79, which classifies improper neutralization of input during web page generation. The lack of robust output validation allows malicious payloads to bypass standard security controls that might otherwise mitigate simpler injection attempts, enabling the execution of arbitrary JavaScript in the context of the victim's session and the trusted domain hosting the application.
The operational impact of this vulnerability is severe due to its potential for widespread exploitation through social engineering or phishing campaigns. An attacker can craft a malicious link containing the XSS payload and distribute it via email, instant messaging, or other communication channels. When an unsuspecting user clicks the link while logged into KuteShop, their browser executes the injected script automatically. This enables session hijacking where the attacker steals sensitive cookies such as authentication tokens, allowing them to impersonate the victim and gain unauthorized access to their account. Furthermore, it facilitates credential harvesting by redirecting users to fake login pages or stealing entered credentials directly through keylogging scripts embedded in the payload. The vulnerability also supports drive-by attacks where additional malware can be downloaded onto the user's device without consent, leading to broader system compromise beyond just the web application layer.
In terms of threat modeling and adversary behavior, this exploitation technique maps closely to techniques found in the MITRE ATT&CK framework, specifically under the Initial Access tactic using Phishing for Information or Execution via Browser Scripting. Attackers leverage these methods to establish a foothold within an organization's digital environment by compromising individual user accounts which may serve as gateways to more sensitive internal resources if privilege escalation is possible later in the attack chain. The unauthenticated nature of this flaw means that initial access does not require prior reconnaissance or credential theft, making it particularly dangerous for public-facing applications where any internet-connected device can initiate an exploit attempt.
To mitigate this vulnerability and prevent similar issues in future development cycles, immediate remediation involves upgrading KuteShop to a version newer than 4.2.9 where the developers have implemented proper input validation and output encoding strategies. For organizations unable to upgrade immediately due to compatibility constraints or operational dependencies, implementing Web Application Firewall rules can provide temporary protection by detecting and blocking common XSS payload patterns in HTTP requests. Additionally, enforcing strict Content Security Policy headers is recommended as a defense-in-depth measure. These policies restrict the sources from which scripts can be loaded and executed, thereby neutralizing many inline script injection attacks even if they bypass input validation checks. Developers must also adopt secure coding practices that prioritize sanitization of all user inputs at both client-side and server-side levels to ensure data integrity and confidentiality are maintained across the application lifecycle.