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ChatGPT Cross-Account Data Leakage via Sandbox Channel

ChatGPT Cross-Account Data Leakage via Sandbox Channel

ATLAS OWASP CRITICAL Active exploitation · Immediate action required ▲ 9.2 Check Point Research

Check Point Research uncovered a covert cross-account communication channel in ChatGPT's code-execution sandbox that allowed an attacker to hijack a victim's session and exfiltrate data from connected services such as Gmail. The attack exploited a shared internal package delivery service reachable by containers belonging to different user accounts, bypassing inter-container isolation. The channel could be triggered silently via malicious prompts, shared conversations, or custom GPTs without appearing in the victim's visible response.

ChatGPT Prompt Injection Exfiltrates Gmail Data via Hidden Channel

ChatGPT Prompt Injection Exfiltrates Gmail Data via Hidden Channel

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 9.2 The Hacker News

Check Point Research demonstrated a prompt injection attack against ChatGPT that allowed a hidden instruction to silently read a victim's connected Gmail data and exfiltrate it to an attacker-controlled account through an internal inter-container service. The attack exploited ChatGPT's agentic tool-use defaults, which permit reading connected apps without user confirmation under the 'Important actions' permission model. OpenAI has since taken the internal service used as the covert channel offline, but the underlying permission design and injection vectors remain a structural concern.

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.

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