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ChatGPT Vulnerability Enables Gmail Data Theft via Hidden Channel

ChatGPT Vulnerability Enables Gmail Data Theft via Hidden Channel

First seen 8 Sep 2026, 15:46 UTC • •

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ThreatCluster AI
ThreatCluster •September 9, 2026 at 15:16 UTC
  • •A vulnerability in ChatGPT allows attackers to exfiltrate Gmail data from victims without their knowledge.
  • •The exploit requires a hidden instruction to be present in the victim's ChatGPT session.
  • •OpenAI has decommissioned the internal service used for this exploit following its disclosure.

Check Point Research revealed a vulnerability in ChatGPT that allows attackers to exfiltrate data from a victim's connected Gmail account without their knowledge. The exploit involves a hidden cross-account communication channel that can be activated by a planted instruction in a ChatGPT conversation. This instruction can be delivered through various methods, including a pasted prompt, a shared conversation link, or a custom GPT. Once activated, the attacker can access the victim's Gmail data and other connected services, with the victim unaware of any unusual activity. The flaw lies in the infrastructure of ChatGPT's code-execution containers, which, while isolated, can communicate through a shared internal service. OpenAI has confirmed that this internal service has been taken offline following the discovery. No CVE has been assigned to this issue, and there are currently no patches available for users to install.

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Timeline

2026-09-08
Check Point Research publishes findings
A report detailing the vulnerability in ChatGPT that allows data exfiltration from Gmail was released.
Thehackernews
2026-09-08
OpenAI confirms internal service taken offline
Following the report, OpenAI confirmed that the internal service facilitating the exploit has been decommissioned.
Thecyberexpress
2026-09-09
Public disclosure of the exploit
Check Point Research disclosed the exploit publicly, detailing the methods and implications for user data security.
Research.Checkpoint

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