---
id: CVE-2026-80098
title: >-
  Improper verification of cryptographic signature in Copilot Studio allows an
  unauthorized attacker to elevate privileges over a network.
summary: >-
  Improper verification of cryptographic signature in Copilot Studio allows an
  unauthorized attacker to elevate privileges over a network.
severity: critical
cvss: 9.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N'
cwe:
  - CWE-347
vendor: microsoft
product: copilot_studio
affected:
  - copilot_studio
published: '2026-09-03'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T17:53:07.297'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80098'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80098'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-04T00:00:00+00:00'
epss: 0.00334
epssPercentile: 0.26837
ingestedAt: '2026-09-05T21:45:15.287Z'
---

## Overview

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

## Affected

- `copilot_studio`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.