Miggo Security Ltd. reports a mitigated vulnerability in Google Gemini that allowed indirect prompt injection to bypass calendar privacy and exfiltrate meeting data. Researchers demonstrated a three-stage exploit embedding benign-looking instructions in calendar invites that later caused Gemini to create events containing private meeting summaries, which could be visible to attackers in some enterprise configurations. Google confirmed and patched the issue.
Key Points
- 1Demonstrates indirect prompt injection enabling calendar-based exfiltration of private meeting summaries
- 2Shows existing defenses fail because benign-looking text triggers tool-level permissions and authorization bypass
- 3Requires runtime semantic analysis, intent attribution and data-provenance controls in LLM-integrated applications
Scoring Rationale
High severity and confirmed mitigation by Google; limited to Gemini calendar integration rather than universal LLM platforms.
Sources
Public references used for this report.
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