CVE-2026-80098

critical

Microsoft

CVSS v3 Base Score

9.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

EPSS Score

0.3%

Exploitation probability in 30 days

Top 78% most likely to be exploited

Attack Characteristics

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Confidentiality

Low

Integrity

High

Availability

None

Published: September 3, 2026 (7 days ago)

Last Modified: September 8, 2026

Source: NVD

Description

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

CWE-347

microsoft copilot studio