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CVE-2026-24301: Microsoft Copilot One-Click Data Exfiltration

CVE-2026-24301: Microsoft Copilot One-Click Data Exfiltration

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 9.1 The Hacker News

Varonis Threat Labs disclosed three vulnerabilities in Microsoft Copilot Personal, collectively named CoSnitch (CVE-2026-24301), that allow an attacker to silently exfiltrate data from connected services with a single crafted link. The attack exploits an undocumented autorun=1 URL parameter that Copilot itself revealed during adversarial meta-hacking interrogation, enabling automatic prompt execution inside the victim's authenticated session. A separate third vulnerability allows persistent memory poisoning via web page summarization, potentially shaping future Copilot sessions.

CoSnitch Attack Forces Copilot to Expose Its Own Architecture

CoSnitch Attack Forces Copilot to Expose Its Own Architecture

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 8.2 Dark Reading

Researchers demonstrated a 'meta-hacking' technique dubbed CoSnitch that manipulates Microsoft Copilot into disclosing its own internal security weaknesses and architectural details. The attack leverages the AI system's own reasoning capabilities against itself, effectively turning the assistant into an unwitting reconnaissance tool. This class of vulnerability has significant implications for enterprise deployments where Copilot has access to sensitive organisational infrastructure and data.

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