# Microsoft Copilot flaw exposed via hidden prompt, enabling hack

Security researchers discovered a hidden input in Microsoft's Copilot AI that could be exploited to bypass safeguards and hijack the assistant. The vulnerability allowed malicious prompts to override system controls, raising concerns about AI security. Microsoft has issued a fix after the disclosure.

**Importance:** 4/5

## Sources

### Technology
- [Ars Technica](https://arstechnica.com/security/2026/08/microsoft-copilot-reveals-secret-input-that-allowed-it-to-be-hacked/) — Tue, 18 Aug 2026 13:00:04 +0000