CVE-2026-1151 identifies a cross-site scripting (XSS) vulnerability in the User Center component of the technical-laohu mpay product, specifically affecting versions 1.2.0 through 1.2.4. The vulnerability stems from insufficient sanitization or encoding of the Nickname parameter, which is manipulated to inject malicious JavaScript code. This flaw allows remote attackers to craft payloads that execute arbitrary scripts in the context of authenticated users' browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The vulnerability requires the attacker to have high privileges (PR:H) and user interaction (UI:P), indicating that exploitation is not trivial and likely involves social engineering or insider threat scenarios. The CVSS 4.0 score of 4.8 reflects a medium severity, with network attack vector (AV:N), low attack complexity (AC:L), no privileges required for the attack initiation (AT:N), but high privileges needed for exploitation (PR:H), and user interaction required (UI:P). No known exploits are currently active in the wild, but public proof-of-concept code exists, increasing the risk of future exploitation. The vulnerability does not affect confidentiality, integrity, or availability directly but compromises user trust and session security. No official patches have been linked yet, so mitigation relies on input validation and output encoding best practices.

For European organizations, especially those in financial services or sectors relying on technical-laohu mpay for payment processing or user management, this vulnerability poses a risk of client-side script injection attacks. Successful exploitation could lead to theft of user credentials, session tokens, or unauthorized transactions, undermining customer trust and potentially causing regulatory compliance issues under GDPR due to compromised personal data. The medium severity and requirement for high privileges and user interaction reduce the likelihood of widespread automated attacks but do not eliminate targeted attacks or insider threats. Organizations with public-facing User Center components are particularly at risk. The lack of known exploits in the wild currently limits immediate impact, but availability of proof-of-concept code suggests attackers may develop exploits soon. Failure to address this vulnerability could lead to reputational damage and financial losses, especially in countries with stringent data protection laws and high adoption of the affected software.

1. Immediately assess and inventory all instances of technical-laohu mpay in use, identifying versions 1.2.0 through 1.2.4. 2. Apply vendor patches as soon as they become available; if no patches exist, implement web application firewall (WAF) rules to detect and block suspicious input targeting the Nickname parameter. 3. Enforce strict input validation on the Nickname field, allowing only safe characters and rejecting or sanitizing any input containing script tags or special characters. 4. Implement robust output encoding/escaping on all user-supplied data rendered in the User Center interface to prevent script execution. 5. Educate privileged users about phishing and social engineering risks to reduce the chance of user interaction leading to exploitation. 6. Monitor logs for unusual activity related to the User Center and Nickname parameter to detect attempted exploitation. 7. Consider isolating or restricting access to the User Center component to trusted networks or users where feasible. 8. Conduct regular security assessments and penetration testing focusing on XSS vulnerabilities in user input fields.