CVE-2025-48621 is a vulnerability identified in the DefaultTransitionHandler.java component of Google Android operating system versions 13, 14, 15, and 16. The issue stems from an insecure default configuration that allows a tapjacking attack vector. Tapjacking involves tricking a user into tapping on a concealed or disguised UI element, enabling an attacker to perform unauthorized actions on the device. In this case, the vulnerability can be exploited locally without requiring additional execution privileges, but it does require user interaction to succeed. This means an attacker must convince the user to tap on a malicious overlay or UI element crafted to hijack input events. The vulnerability leads to a local elevation of privilege, potentially allowing malicious applications or actors to gain higher privileges than intended, compromising device integrity or confidentiality. No CVSS score has been assigned yet, and there are no known exploits in the wild at the time of publication. The vulnerability was reserved in May 2025 and published in December 2025, indicating recent discovery and disclosure. The lack of a patch link suggests that fixes may still be pending or in development. The vulnerability affects multiple recent Android versions, which are widely deployed globally, including across Europe.

For European organizations, this vulnerability poses a risk primarily to mobile device security, especially for employees using Android smartphones and tablets for work purposes. Successful exploitation could allow attackers to escalate privileges locally, potentially bypassing security controls and accessing sensitive corporate data or systems. This could lead to unauthorized data access, manipulation, or installation of malicious software with elevated rights. The requirement for user interaction limits remote exploitation but does not eliminate risk, as social engineering or phishing could facilitate the necessary user taps. Organizations with Bring Your Own Device (BYOD) policies or those relying heavily on Android devices for business-critical applications are particularly vulnerable. The impact extends to sectors with high mobile device usage such as finance, healthcare, and government, where data confidentiality and integrity are paramount. Additionally, the widespread use of Android in Europe means that a large number of devices could be affected, increasing the attack surface. The absence of known exploits currently reduces immediate risk but does not preclude future exploitation once the vulnerability becomes more widely understood.

1. Monitor Google’s official security advisories and promptly apply any patches or updates addressing CVE-2025-48621 once released. 2. Implement strict app permission policies to limit the ability of apps to create overlays or capture input events, reducing the risk of tapjacking. 3. Educate users about the dangers of tapjacking and encourage vigilance when interacting with unexpected or suspicious UI elements, especially those requesting sensitive actions. 4. Employ mobile device management (MDM) solutions to enforce security policies, restrict installation of untrusted apps, and control device configurations. 5. Use security tools that can detect or block overlay attacks or suspicious UI behaviors indicative of tapjacking attempts. 6. For high-risk environments, consider restricting the use of Android devices or enforcing hardened configurations that minimize exposure to UI-based attacks. 7. Encourage users to keep their devices updated and avoid installing apps from untrusted sources to reduce the risk of malicious overlays. 8. Conduct regular security awareness training focusing on social engineering and UI manipulation attack vectors.