CVE-2026-80098

Received Received - Intake

Improper Cryptographic Signature Verification in Copilot Studio

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-03

Last Modified

2026-09-03

Generated

2026-09-04

AI Q&A

2026-09-04

EPSS Evaluated

N/A

NVD

CVE-2026-80098

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	copilot_studio	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-347	The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Attack-Flow Graph

Executive Summary

This vulnerability involves improper verification of cryptographic signatures in Copilot Studio. An unauthorized attacker could exploit this to gain elevated privileges over a network without proper authentication.

Impact Analysis

An attacker could take control of Copilot Studio functions, modify data, or perform unauthorized actions. This could lead to data breaches, system manipulation, or further network compromise depending on the system's role.

Compliance Impact

This vulnerability could violate compliance requirements that mandate strict access controls and data integrity, such as GDPR's security principles or HIPAA's safeguards for protected health information.

Mitigation Strategies

Apply the latest security patches from Microsoft for Copilot Studio immediately. Disable network access to Copilot Studio if not required. Monitor network traffic for unusual privilege elevation attempts. Review and restrict user permissions in Copilot Studio to minimize potential impact.

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