CVE-2025-23643 in ReadMe Creator Plugin
Summary
by MITRE • 01/22/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in NotFound ReadMe Creator allows Reflected XSS. This issue affects ReadMe Creator: from n/a through 1.0.
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Analysis
by VulDB Data Team • 02/09/2025
This vulnerability represents a classic cross-site scripting flaw that undermines the security of web applications by allowing malicious scripts to execute in users' browsers. The issue specifically resides in the NotFound ReadMe Creator application where input validation and output sanitization mechanisms fail to properly neutralize user-supplied data during web page generation processes. The vulnerability is classified as reflected XSS because the malicious payload is embedded in the application's response to a user request, typically through URL parameters or form fields that are not adequately sanitized before being rendered back to the user. This allows attackers to inject malicious scripts that can execute in the context of the victim's browser session, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The affected version range indicates that all versions from the initial release through version 1.0 are susceptible to this vulnerability, suggesting a fundamental flaw in the application's input handling that was not properly addressed during development.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding practices within the ReadMe Creator's web page generation logic. When user input is received through web forms, URL parameters, or other interactive elements, the application fails to properly sanitize or encode this data before incorporating it into dynamically generated HTML content. This creates an environment where malicious scripts can be injected and subsequently executed by the victim's browser. The reflected nature of this XSS vulnerability means that the malicious script is reflected back to the user through the application's normal response handling, making it particularly dangerous as it can be delivered via phishing emails, malicious links, or compromised websites that direct users to the vulnerable application. The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws, and follows the ATT&CK technique T1059.001 for command and scripting interpreter, where attackers leverage XSS to execute malicious code within the victim's browser environment.
The operational impact of this vulnerability extends beyond simple data theft or session manipulation to potentially enable more sophisticated attacks within the victim's browser context. An attacker could exploit this vulnerability to steal session cookies, redirect users to malicious sites, perform actions on behalf of authenticated users, or even install persistent malware through browser-based attacks. The reflected nature of the vulnerability makes it particularly challenging to defend against as the malicious payload is not stored on the server but rather injected into the application's response at runtime. This characteristic means that traditional server-side security controls may not prevent the attack, and the vulnerability can be triggered by simply visiting a malicious URL or clicking on a compromised link. The impact is particularly severe in environments where the ReadMe Creator application is used by multiple users or in scenarios where users have elevated privileges within the application's ecosystem. Organizations utilizing this tool must consider the potential for privilege escalation attacks and the possibility of lateral movement within their network if the application is integrated with other systems.
Mitigation strategies for this vulnerability must address both the immediate security gap and establish long-term defensive measures within the application's architecture. The primary solution involves implementing comprehensive input validation and output encoding mechanisms that sanitize all user-supplied data before it is incorporated into web page content. This includes applying proper HTML entity encoding to all dynamic content, implementing Content Security Policy headers to restrict script execution, and utilizing secure coding practices that prevent the direct inclusion of user input in executable contexts. Organizations should also consider implementing web application firewalls to detect and block suspicious input patterns, conduct regular security assessments to identify similar vulnerabilities in other applications, and establish secure coding guidelines that emphasize input validation and output sanitization. Additionally, developers should implement proper error handling that does not expose internal application details to users, as such information can aid attackers in crafting more sophisticated attacks. The vulnerability serves as a reminder of the critical importance of following secure development lifecycle practices and the necessity of regular security testing to identify and remediate such flaws before they can be exploited in real-world scenarios.