Incident · curated 27 Jun 2026
First reported 6 Jun 2026 · 20d ago
Single-source incident — first reported, latest, and curated coincide.
Prompt injection remains a core threat to deployed LLM assistants, and vendor mitigations like Lockdown Mode are relevant to defenders evaluating how to limit data exfiltration risk.
TechCrunch reports OpenAI introduced a 'Lockdown Mode' designed to reduce the likelihood that sensitive data is shared via prompt injection attacks against ChatGPT. The article notes ChatGPT could still be vulnerable even with the feature enabled.
Why it matters
Prompt injection remains a core threat to deployed LLM assistants, and vendor mitigations like Lockdown Mode are relevant to defenders evaluating how to limit data exfiltration risk.