An invisible notification hack on Android can execute hidden actions of apps while displaying fake links that appear completely safe.
That notification link on Android may not be what it seems and could lead to problems for you.
A new finding in Android security has revealed a vulnerability in the notification system that could allow hackers to trick users into opening unintended links or activating hidden actions within apps. According to studies, the problem lies in how Android interprets certain Unicode characters within notifications, causing a discrepancy between the visible text and what the system actually processes when the “Open link” suggestion appears.
The main risk comes from the use of invisible or special Unicode characters embedded in URLs. These hidden characters can alter how Android interprets the visible text and the actual actionable link. For example, a notification may display “amazon.com,” but the underlying code could open “zon.com,” utilizing a zero-width space character. This means the notification may look like “ama[]zon.com,” where the hidden character is interpreted by the suggestion engine as a separator, leading to a completely different site.
Attackers can not only redirect users to websites but also create deep links that interact directly with apps, as demonstrated with a shortened link that generated a call in WhatsApp. To make these attacks less detectable, cybercriminals may use URL shorteners and hide links within texts that appear trustworthy.
The situation becomes particularly dangerous when this vulnerability is combined with deep links that can silently trigger actions such as sending messages or making calls without the user's knowledge. Tests conducted on devices like the Google Pixel 9 Pro XL, Samsung Galaxy S25, and earlier versions of Android have shown that this anomalous behavior affects major applications such as WhatsApp, Telegram, Instagram, Discord, and Slack. Additionally, custom applications have been used to bypass character filters and validate the attack in various scenarios.
Given the nature of this vulnerability, many standard defenses may not be effective. Even the best antivirus solutions may overlook these exploits, as they do not always involve traditional malware downloads. Instead, attackers manipulate user interface behavior and exploit app link settings. Therefore, it is crucial to have endpoint protection tools that offer broader detection based on behavioral anomalies.
For users at risk of credential theft or app abuse, relying on identity theft protection services becomes vital to monitor unauthorized activities and safeguard exposed personal data. Until a formal solution is implemented, Android users are advised to remain alert with notifications and links, especially those coming from unknown sources or URL shorteners.
