Microsoft patched a Copilot Studio prompt injection. The data exfiltrated anyway.

VentureBeat
Apr 15, 2026, 4:58 pm189 ptsTop
Microsoft assigned CVE-2026-21520, a CVSS 7.5 indirect prompt injection vulnerability, to Copilot Studio. Capsule Security discovered the flaw, coordinated disclosure with Microsoft, and the patch was deployed on January 15. Public disclosure went live on Wednesday. That CVE matters less for what it fixes and…

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