The identified vulnerability involves a weaponized calendar invite mechanism within Google Gemini, a Google service integrated with calendar functionalities. Attackers can craft a specially designed event invitation payload that, when sent to a victim, results in the leakage of private meeting summaries from the victim’s calendar. This occurs because the invite triggers the exposure of event details that are normally protected, bypassing standard access controls. The attack does not require the victim to authenticate or interact with the invite beyond receiving it, increasing the risk of stealthy data exfiltration. While the affected versions are unspecified and no patches have been released yet, the vulnerability highlights a flaw in how Google Gemini processes calendar invites and handles event data privacy. The lack of known exploits in the wild suggests it is not yet actively weaponized, but the potential for privacy breaches is significant, especially for organizations relying heavily on Google’s calendar services for confidential meetings. The vulnerability primarily impacts confidentiality, as meeting summaries may contain sensitive business information, strategic discussions, or personal data. The ease of exploitation is moderate due to the need to send crafted invites, but no user interaction or authentication is required, which lowers the barrier for attackers. The scope is limited to users of Google Gemini calendar services, but given Google’s widespread adoption, the affected population could be large.

For European organizations, this vulnerability could lead to unauthorized disclosure of sensitive meeting information, undermining confidentiality and potentially exposing strategic business plans, personal data, or regulatory compliance details. This data leakage could facilitate corporate espionage, insider threats, or targeted phishing campaigns. The impact is particularly concerning for sectors with high privacy requirements such as finance, healthcare, legal, and government institutions. Although availability and integrity are not directly affected, the breach of confidentiality alone can cause reputational damage, regulatory penalties under GDPR, and loss of competitive advantage. Organizations using Google Gemini extensively for calendar management are at higher risk, especially if they do not have strict controls on calendar sharing and event creation. The absence of known exploits in the wild currently limits immediate risk, but the vulnerability’s existence demands proactive measures to prevent future exploitation.

Organizations should immediately review and tighten calendar invite permissions within Google Gemini and Google Workspace settings, restricting who can create and modify calendar events. Implement monitoring and alerting for unusual calendar event creation patterns, such as invites from unknown or external sources containing suspicious payloads. Educate employees about the risks of accepting calendar invites from untrusted senders and encourage verification of unexpected meeting requests. Apply the principle of least privilege to calendar sharing and event visibility, ensuring sensitive meetings are not broadly accessible. Stay informed about updates and patches from Google addressing this vulnerability and deploy them promptly once available. Consider using additional data loss prevention (DLP) tools that monitor calendar data flows and enforce organizational policies. For highly sensitive meetings, use alternative communication channels or encrypted meeting platforms until the vulnerability is fully mitigated.