What is CVE-2026-80098?

CVE-2026-80098 is a critical-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.3/10. Published 2026-09-03.

How severe is CVE-2026-80098?

Critical severity. CVSS v3 base score is 9.3 out of 10.

CVE-2026-80098

CVE-2026-80098

Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N.

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

secure@microsoft.com

Frequently asked questions

What is CVE-2026-80098?: CVE-2026-80098 is a critical-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.3/10. Published 2026-09-03.
How severe is CVE-2026-80098?: Critical severity. CVSS v3 base score is 9.3 out of 10.