CVE-2025-48127 is a Missing Authorization vulnerability (CWE-862) identified in the 'App Cheap' Push notification service for Mobile and Web applications, affecting versions up to 2.0.3. This vulnerability arises from incorrectly configured access control mechanisms, allowing unauthorized users to bypass authorization checks. Specifically, the flaw permits exploitation of the push notification system without proper verification of user privileges, potentially enabling attackers to send or manipulate push notifications intended for other users or systems. The vulnerability does not require authentication or user interaction, and can be exploited remotely over the network. According to the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N), the attack vector is network-based with low attack complexity, no privileges required, and no user interaction needed. The impact affects confidentiality and integrity but not availability. Although no patches have been linked yet, the vulnerability is publicly disclosed and assigned a medium severity score of 6.5. No known exploits are currently reported in the wild. The vulnerability could be leveraged to send unauthorized or malicious push notifications, potentially leading to information leakage or manipulation of user communications within the affected applications.

For European organizations using the 'App Cheap' Push notification service, this vulnerability poses a risk of unauthorized access to push notification channels. This could lead to leakage of sensitive information contained in notifications or manipulation of notification content, undermining user trust and potentially facilitating social engineering or phishing attacks. Organizations relying on these notifications for critical alerts or user engagement may experience integrity issues, where attackers could inject misleading or harmful messages. While availability is not directly impacted, the reputational damage and potential regulatory consequences related to data protection laws such as GDPR could be significant. The medium severity rating suggests a moderate risk, but the lack of authentication requirements and ease of exploitation increase the urgency for mitigation. European entities in sectors such as finance, healthcare, and public services that use mobile/web push notifications for sensitive communications are particularly at risk.

To mitigate CVE-2025-48127, organizations should first verify whether they use the affected 'App Cheap' Push notification service version 2.0.3 or earlier. Immediate steps include implementing additional access control layers at the application or network level to restrict unauthorized access to push notification endpoints. Employing API gateways or web application firewalls (WAFs) to enforce strict authentication and authorization policies can help prevent exploitation. Monitoring and logging push notification activities for anomalies is critical to detect potential abuse. Since no official patches are currently available, organizations should engage with the vendor for updates or consider temporary workarounds such as disabling push notifications until a fix is released. Additionally, educating users about potential phishing attempts via push notifications can reduce the impact of manipulated messages. Finally, integrating push notification services with strong identity and access management (IAM) frameworks will help prevent unauthorized use.