CVE-2026-57742 in Kids Planet Plugin
Summary
by MITRE • 10/10/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeREX Group Kids Planet allows Reflected XSS.
This issue affects Kids Planet: from n/a through 2.2.14.2.
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Analysis
by VulDB Data Team • 10/10/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-site Scripting or XSS. Specifically, this vulnerability manifests as a Reflected XSS within the Kids Planet theme developed by ThemeREX Group. In a reflected attack vector, malicious script code is embedded directly into a URL query parameter or form input field and sent to the vulnerable web application. The server processes this request without adequately sanitizing or encoding the user-supplied data before including it in the HTTP response. Consequently, when an unsuspecting victim clicks on a crafted link containing the malicious payload, their browser executes the injected script within the context of the trusted website domain. This mechanism allows attackers to bypass same-origin policy restrictions and interact with the page as if they were legitimate users or scripts originating from that site.
The technical root cause lies in the failure of the application to properly validate, filter, or encode special characters such as angle brackets, quotes, and ampersands within user-controlled input fields before rendering them into HTML output. By treating untrusted data as executable code rather than inert text, the web server creates an execution environment where arbitrary JavaScript can run. This is particularly dangerous because reflected XSS attacks are often delivered via phishing campaigns or malicious links shared on social media platforms, making it difficult for users to distinguish between legitimate and compromised URLs until after they have interacted with them. The vulnerability affects versions of Kids Planet ranging from the initial release up through version 2.2.14.2, indicating a persistent lack of input sanitization across multiple iterations of the software unless explicitly patched in later releases.
The operational impact of this vulnerability is significant and multifaceted. Once an attacker successfully executes JavaScript in the victim's browser, they can perform session hijacking by stealing authentication cookies or tokens stored locally on the client side. This enables the adversary to impersonate the user, gaining unauthorized access to their account without needing credentials. Furthermore, the attacker can manipulate the DOM (Document Object Model) of the page to deface content, redirect users to malicious phishing sites designed to harvest sensitive information such as credit card numbers or login details, or deploy further malware through drive-by downloads if browser vulnerabilities are present. In enterprise environments where this theme might be used for internal portals, it could lead to broader network compromise by serving as an entry point for lateral movement after initial access is gained through social engineering tactics targeting employees with privileged accounts.
From a classification perspective, this vulnerability aligns directly with CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). It also maps closely to the MITRE ATT&CK framework technique T1059.007, which covers JavaScript execution under command and script interpretation. Understanding these mappings is crucial for security teams as it allows them to leverage existing detection rules and mitigation strategies associated with standard XSS patterns rather than treating each instance in isolation. The reflected nature of the attack means that exploitation requires user interaction, but this does not diminish its severity given the high success rate of social engineering techniques used by modern threat actors to trick users into clicking malicious links.
To mitigate this vulnerability, immediate action is required for all systems running Kids Planet versions prior to 2.2.14.3 or later where a fix has been provided. The primary remediation strategy involves updating the theme to the latest patched version released by ThemeREX Group, which should include proper input validation and output encoding mechanisms. For organizations unable to update immediately due to compatibility concerns with other plugins or custom code, temporary mitigations must be implemented at the web server level or through a Web Application Firewall (WAF). These controls can inspect incoming HTTP requests for suspicious patterns such as script tags, event handlers like onerror or onload, and encoded variants of these strings. Additionally, implementing Content Security Policy headers with strict directives regarding script sources can significantly reduce the impact by preventing unauthorized scripts from executing even if they are injected into the page. Developers should also adopt secure coding practices that emphasize context-sensitive output encoding based on where data is being inserted within HTML, JavaScript, CSS, or URL contexts to prevent similar flaws in future development cycles.