CVE-2026-80098: critical vulnerability in Microsoft Copilot Studio
Copilot Studio Elevation of Privilege Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. It has an official Brazilian government alert.
ssvc Trackcvss 9.3epss 0.5%
Official alert in Brazil
Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.
- CISC Gov.br · 09 Sep 2026Boletim do CISC de Vulnerabilidadesread on gov.br ↗
Source: CTIR Gov (GSI) and CISC Gov.br, under the CC BY-ND 3.0 license.
Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.
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
Affected products
Microsoft · Microsoft Copilot StudioRelated CVEs — Microsoft Copilot Studio
In the same product, most dangerous first.
CVE-2024-38206HIGHMicrosoft Copilot Studio Information Disclosure VulnerabilityEPSS 12.3%CVE-2026-21520HIGHCopilot Studio Information Disclosure VulnerabilityEPSS 1.5%CVE-2024-43610HIGHCopilot Studio Information Disclosure VulnerabilityEPSS 1.0%CVE-2024-49038CRITICALMicrosoft Copilot Studio Elevation Of Privilege VulnerabilityEPSS 1.0%