CVE-2024-42834 is a stored cross-site scripting (XSS) vulnerability identified in the Create Customer API of the Incognito Service Activation Center (SAC) UI version 14.11. The flaw arises because the application fails to properly sanitize or encode user-supplied input in the lastName parameter, allowing authenticated attackers to inject crafted HTML or JavaScript payloads. When this malicious input is stored and subsequently rendered in the UI, it executes in the context of other users' browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed with the victim's privileges. The vulnerability requires the attacker to have valid authentication credentials and some level of user interaction to trigger the payload. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) indicates network attack vector, low attack complexity, privileges required, user interaction required, scope changed, and low impact on confidentiality and integrity, with no impact on availability. No patches or known exploits are currently available, but the vulnerability is publicly disclosed and should be addressed promptly. The weakness corresponds to CWE-79, a common and well-understood XSS category.

The primary impact of this vulnerability is on confidentiality and integrity within affected organizations. Successful exploitation can allow attackers to execute arbitrary scripts in the context of other users, potentially leading to theft of session tokens, user credentials, or manipulation of displayed data. This can facilitate further attacks such as privilege escalation or lateral movement within the network. Since the vulnerability requires authentication and user interaction, the attack surface is somewhat limited but still significant in environments where multiple users have access to the SAC UI. The lack of availability impact means systems remain operational, but the trustworthiness of the interface and data integrity is compromised. Organizations in telecommunications or service activation sectors using this product may face reputational damage, regulatory scrutiny, and operational risks if exploited.

To mitigate CVE-2024-42834, organizations should first monitor vendor communications for official patches or updates and apply them promptly once available. In the interim, implement strict input validation and output encoding on the lastName parameter and any other user-supplied inputs to prevent injection of malicious scripts. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser. Limit user privileges to the minimum necessary to reduce the impact of compromised accounts. Conduct regular security training to raise awareness about phishing and social engineering, which could facilitate exploitation. Additionally, review and harden authentication mechanisms to prevent unauthorized access. Logging and monitoring for unusual activity related to the Create Customer API can help detect attempted exploitation early. Finally, consider isolating the SAC UI environment or restricting access to trusted networks until the vulnerability is remediated.