CVE-2026-80098

Critical9.3Published on September 3, 2026

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

CVSS score9.3 / 10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

Weakness type (CWE)CWE-347

Vendorsmicrosoft

Affected products

Vendors	Product	Versions
microsoft	copilot studio	-

Microsoft fixed 966 flaws in record September Patch Tuesday, including two exploited Windows privilege-escalation zero-days leading to SYSTEM access.

This product uses the NVD API but is not endorsed or certified by the NVD.