EUVD Vulnerability Catalog

EUVD-2026-70794

Severity: CRITICAL Base Score: 9.3 CVSS Version: 3.1

Vulnerability Description

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

Below is the complete, human-readable breakdown of the CVSS metric string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N/E:U/RL:O/RC:C

▪ Attack Vector (AV): Network

▪ Attack Complexity (AC): Low

▪ Privileges Required (PR): None

▪ User Interaction (UI): None

▪ Scope (S): Changed

▪ Confidentiality Impact (C): Low

▪ Integrity Impact (I): High

▪ Availability Impact (A): None

▪ E: Unchanged

▪ RL: O

▪ RC: Changed

Vendor Microsoft

Database Authority

European Union Agency for Cybersecurity (ENISA) EUVD

Assigner

microsoft

EPSS Probability

0.29

Known Aliases

CVE-2026-80098 GHSA-r9hf-26xj-x88v

Published On

2026-09-03

Last Updated

2026-09-09