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Microsoft patched a Copilot Studio prompt injection. The data exfiltrated anyway.
β’9 min readβ’
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Level:Intermediate
For:AI Security Engineers, ML Engineers, Data Scientists
β¦TL;DR
Microsoft has patched a CVE-2026-21520 vulnerability in Copilot Studio, a CVSS 7.5 indirect prompt injection vulnerability that was discovered by Capsule Security, allowing for potential data exfiltration. Despite the patch being deployed on January 15, the vulnerability still poses a risk as data exfiltration was possible, highlighting the ongoing challenges in securing AI-powered tools like Copilot Studio.
β‘ Key Takeaways
- A CVE-2026-21520 vulnerability was discovered in Microsoft's Copilot Studio, classified as a CVSS 7.5 indirect prompt injection vulnerability.
- The vulnerability was discovered by Capsule Security and a patch was deployed by Microsoft on January 15, with public disclosure following on Wednesday.
- Despite the patch, data exfiltration was still possible, underscoring the complexities of securing AI-driven systems against prompt injection attacks.
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