CVE-2024-50800 is a Cross Site Scripting (XSS) vulnerability classified under CWE-79, affecting M2000 Smart4Web software versions prior to 5.020241004. The vulnerability arises from improper sanitization of the 'error' parameter in the URL, allowing remote attackers to inject and execute arbitrary JavaScript code within the context of the victim's browser session. This flaw enables attackers to perform actions such as session hijacking, defacement, or redirecting users to malicious sites. Exploitation requires the attacker to have low privileges (PR:L) and some user interaction (UI:R), typically involving social engineering to convince a user to click a crafted URL. The vulnerability has a CVSS 3.1 base score of 6.1, indicating a medium severity level, with attack vector being network (AV:N), low attack complexity (AC:L), and scope changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. Confidentiality and integrity impacts are low, while availability is not affected. No patches or exploits are currently publicly available, but the vulnerability is officially published and reserved as of late October 2024. The lack of a patch means organizations must rely on mitigating controls until an update is released.

The primary impact of CVE-2024-50800 is on the confidentiality and integrity of user sessions and data within applications running M2000 Smart4Web. Successful exploitation could allow attackers to steal session cookies, impersonate users, or manipulate displayed content, potentially leading to unauthorized access or misinformation. While availability is unaffected, the reputational damage and potential data leakage could be significant for organizations relying on this software. Since exploitation requires user interaction, the risk is somewhat mitigated but remains notable in environments with high user exposure to untrusted content or phishing attempts. Organizations in sectors such as government, finance, and critical infrastructure using M2000 Smart4Web could face targeted attacks aiming to leverage this vulnerability for espionage or disruption.

Organizations should monitor for official patches from the M2000 Smart4Web vendor and apply updates promptly once available. In the interim, implement strict input validation and output encoding on the 'error' parameter to neutralize malicious scripts. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. Educate users about the risks of clicking on suspicious links and implement web application firewalls (WAFs) with rules designed to detect and block XSS payloads targeting this parameter. Regularly audit and test web applications for XSS vulnerabilities using automated scanners and manual penetration testing. Additionally, consider disabling or restricting the use of the vulnerable feature if feasible until a patch is applied.