CVE-2026-80098

What it is

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

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data tampering.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-03 23:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-08 17:53 UTC Last updatedMost recent change to the record

Details

Published

2026-09-03 23:17 UTC

Last modified

2026-09-08 17:53 UTC

Exploit probability

0.5% · EPSS, next 30 days

Weakness

CWE-347

Record status

Analyzed

Affected

• Microsoft Copilot Studio

Attack profile CVSS 3.1 · 9.3

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

Low

Integrity

High

Availability

None