CVE-2025-9102 is a security vulnerability identified in version 8.8.0 of the 1&1 Mail & Media mail.com Android application. The vulnerability arises from improper exportation of Android application components declared in the AndroidManifest.xml file, specifically within the component com.mail.mobile.android.mail. Improperly exported components can be accessed by other applications or processes on the same device, potentially allowing unauthorized local attackers to interact with these components. This can lead to unauthorized actions such as data leakage, privilege escalation, or manipulation of app behavior. The vulnerability requires local access to the device (attack vector: local), with low attack complexity and low privileges needed, and does not require user interaction. The impact on confidentiality, integrity, and availability is limited but present, as indicated by the CVSS 4.0 base score of 4.8 (medium severity). The vendor was notified but has not responded or issued a patch, and the exploit details have been publicly disclosed, increasing the risk of exploitation. Although no known exploits are currently in the wild, the public disclosure and lack of vendor response elevate the urgency for mitigation. The vulnerability affects only the specified version 8.8.0 of the mail.com app on Android devices.

For European organizations, this vulnerability poses a moderate risk primarily to employees or users who utilize the mail.com Android application version 8.8.0 on their devices. If exploited, attackers with local access could potentially access or manipulate sensitive email data, disrupt mail functionality, or leverage the exported components to escalate privileges within the app context. This could lead to leakage of confidential communications or unauthorized actions within the mail app environment. Organizations with BYOD policies or those that allow mail.com app usage on corporate devices are at higher risk. The impact is more pronounced in sectors handling sensitive communications such as finance, legal, healthcare, and government. However, since the vulnerability requires local access and low privileges, remote exploitation is not feasible, limiting the attack surface. The lack of vendor patching increases the window of exposure, necessitating proactive mitigation. Overall, the threat could undermine confidentiality and integrity of communications but is unlikely to cause widespread availability disruption.

1. Immediate mitigation should involve auditing and restricting the use of the mail.com Android app version 8.8.0 within corporate environments, especially on devices with sensitive data. 2. Encourage users to update to a newer, patched version of the app once available; until then, consider disabling or uninstalling the vulnerable app on corporate devices. 3. Implement mobile device management (MDM) policies to control app installations and enforce security configurations that limit local app interactions. 4. Educate users about the risks of installing untrusted apps and the importance of device security to prevent unauthorized local access. 5. Monitor devices for unusual local activity or privilege escalations related to the mail.com app components. 6. If possible, use Android security features such as app sandboxing and permission restrictions to limit inter-app communication. 7. Engage with the vendor for updates and patches, and consider alternative secure email clients if the vendor remains unresponsive. 8. Regularly review and update security policies to address vulnerabilities arising from third-party applications.