CVE-2025-11127 is a critical authorization bypass vulnerability identified in the Mstoreapp Mobile App WordPress plugin (through version 2.08) and Mstoreapp Mobile Multivendor plugin (through version 9.0.1). The root cause is improper verification of user identity during an AJAX action, which allows unauthenticated attackers to retrieve valid session tokens for arbitrary users if they know the users' email addresses. This vulnerability is classified under CWE-639, which relates to authorization bypass through user-controlled keys or parameters. The attack vector requires no authentication or user interaction, making it highly accessible to remote attackers. Exploiting this flaw enables attackers to impersonate legitimate users, potentially accessing sensitive personal data, performing unauthorized transactions, or escalating privileges within the affected WordPress environment. Although no public exploits have been reported yet, the vulnerability's nature suggests a high risk of exploitation once disclosed. The absence of a CVSS score indicates the need for an expert severity assessment. The vulnerability affects a widely used WordPress plugin that integrates mobile app functionality with e-commerce platforms, increasing the potential attack surface. The lack of patches or official fixes at the time of publication necessitates immediate mitigation efforts by administrators. This vulnerability undermines the confidentiality and integrity of user sessions and could lead to significant data breaches or fraud in affected systems.

For European organizations, the impact of CVE-2025-11127 can be substantial, especially those relying on WordPress-based e-commerce solutions integrated with the Mstoreapp Mobile App or Multivendor plugins. Successful exploitation allows attackers to hijack user sessions without authentication, compromising user privacy and enabling unauthorized actions such as fraudulent purchases, data theft, or privilege escalation. This can lead to reputational damage, regulatory penalties under GDPR due to personal data exposure, and financial losses. The vulnerability also threatens the integrity of business operations by allowing attackers to manipulate user accounts or administrative functions if targeted users have elevated privileges. Given the widespread use of WordPress and mobile commerce in Europe, the risk extends across multiple sectors including retail, finance, and services. The ease of exploitation and lack of required user interaction increase the likelihood of automated attacks, potentially affecting large numbers of users. Organizations may also face increased incident response costs and customer trust erosion. The vulnerability's presence in mobile app integrations further complicates detection and mitigation, as mobile endpoints may not be as rigorously monitored as traditional web portals.

To mitigate CVE-2025-11127, organizations should immediately restrict access to the vulnerable AJAX endpoints by implementing strict server-side authorization checks that validate user identity beyond just user-controlled parameters like email addresses. Employing robust authentication mechanisms such as OAuth tokens or session validation tied to secure cookies can prevent unauthorized session retrieval. Administrators should monitor logs for unusual AJAX requests or repeated attempts to access sessions by email enumeration. Applying web application firewalls (WAFs) with rules targeting suspicious AJAX activity can provide an additional layer of defense. Until official patches are released, consider disabling or limiting the use of the affected AJAX actions or the entire plugin if feasible. Conduct thorough audits of user session management and ensure session tokens are securely generated and invalidated upon logout. Educate development teams on secure coding practices to prevent authorization bypass issues. Finally, maintain up-to-date backups and incident response plans to quickly recover from potential compromises.