CVE-2025-40638 in Eventobot
Summary
by MITRE • 03/09/2026
A reflected Cross-Site Scripting (XSS) vulnerability has been found in Eventobot. This vulnerability allows an attacker to execute JavaScript code in the victim's browser by sending him/her a malicious URL using the 'name' parameter in '/search-results'. This vulnerability can be exploited to steal sensitive user data, such as session cookies, or to perform actions on behalf of the user.
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Analysis
by VulDB Data Team • 03/12/2026
The reflected cross-site scripting vulnerability identified as CVE-2025-40638 represents a critical security flaw in the Eventobot application that directly compromises user browser integrity. This vulnerability falls under the CWE-79 category, which specifically addresses cross-site scripting flaws where untrusted data is embedded into web pages without proper validation or sanitization. The vulnerability manifests when the application fails to adequately process the 'name' parameter within the '/search-results' endpoint, creating an opening for malicious attackers to inject executable JavaScript code that will execute in the context of the victim's browser session.
The technical exploitation of this vulnerability occurs through a carefully crafted malicious URL that contains JavaScript payload within the 'name' parameter. When a victim clicks such a link, the Eventobot application reflects the malicious input back to the user's browser without proper sanitization, allowing the injected script to execute with the privileges of the victim's session. This reflective nature means that the attack vector does not require persistent storage of malicious code on the server, making the vulnerability particularly dangerous as it can be delivered through various channels including email, messaging applications, or social media platforms. The attack operates entirely within the victim's browser environment, leveraging the legitimate application's trust relationship with the user.
The operational impact of this vulnerability extends far beyond simple script execution, creating significant risks for user data confidentiality and system integrity. Attackers can exploit this flaw to steal session cookies, which would enable them to impersonate users and gain unauthorized access to their accounts. Additionally, the malicious scripts could perform actions on behalf of the user, including modifying account settings, accessing sensitive information, or conducting transactions. The vulnerability creates an attack surface that could lead to privilege escalation, data exfiltration, and potential lateral movement within the application ecosystem. According to ATT&CK framework, this vulnerability maps to T1531 (Account Access Removal) and T1071.004 (Application Layer Protocol: DNS) as attackers could use the stolen session tokens to maintain persistent access or establish command and control channels.
Mitigation strategies for CVE-2025-40638 must focus on implementing robust input validation and output encoding mechanisms throughout the Eventobot application. The primary defense should involve sanitizing all user input parameters, particularly the 'name' parameter in the '/search-results' endpoint, by employing proper HTML encoding and validation techniques before any data is reflected back to the user. Implementing Content Security Policy (CSP) headers would provide an additional layer of protection by restricting the sources from which scripts can be executed. Regular security testing including dynamic application security testing (DAST) and manual penetration testing should be conducted to identify similar vulnerabilities across the application. The application should also implement proper session management practices including secure cookie attributes, session timeout mechanisms, and regular session regeneration to minimize the impact of potential exploitation. Organizations should also consider implementing web application firewalls (WAF) rules specifically designed to detect and block XSS attack patterns targeting the affected endpoint.