Microsoft Patched a Copilot Studio Prompt Injection. The Data Exfiltrated Anyway.

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

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 more for what it signals. Capsule’s research calls Microsoft’s decision to assign a CVE to a prompt injection vulnerability in an agentic p…

Copilot and Agentforce fall to form-based prompt injection tricks

Enterprise AI agents are supposed to streamline workflows. Instead, two fresh findings show they can just as easily streamline data exfiltration. Security researchers have uncovered prompt-injection vulnerabilities in both Microsoft Copilot Studio and Salesforce Agentforce that allow attackers to execute malicious instructions via seemingly harmless prompts. According to Capsule Security findings, SharePoint forms and public-facing lead forms wi…