Event Brief
UPDATED Jun 7, 2026 at 7:03 AM ET
Jun 5, 2026 at 4:03 PM ET
OpenAI introduces Lockdown Mode to block prompt injection
By The BriefBrief
OpenAI announced Lockdown Mode, a security feature for users needing extra protection against prompt injection attacks.
WHO: OpenAI
WHAT: Announced Lockdown Mode security feature for extra protection against prompt injection attacks.
WHEN: Jun 5, 2026 at 3:33 PM ET
WHERE: Location not specified
WHY: Motive not yet established.
How this story developed (showing 2 of 2 earlier reports)
Reporting from 3 identified publishers across this event arc.
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Publishers represented across this event arc
These publishers contributed reporting to the broader event history. Not every source addresses the specific development described above.
How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.
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