CVE-2026-80098: CWE-347: Improper Verification of Cryptographic Signature in Microsoft Microsoft Copilot Studio
Description
CVE-2026-80098 is a critical vulnerability in Microsoft Copilot Studio involving improper verification of cryptographic signatures. This flaw allows an unauthorized attacker to elevate privileges remotely over a network. The vulnerability has a high CVSS score of 9.3, indicating significant impact on confidentiality and integrity. An official fix is available from Microsoft to address this issue.
CVSS v3.1
Score 9.3critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-80098 in Microsoft Copilot Studio is due to improper verification of cryptographic signatures (CWE-347). This weakness enables an attacker without prior privileges to elevate their privileges remotely over a network connection. The CVSS 3.1 base score is 9.3, reflecting network attack vector, low attack complexity, no privileges required, no user interaction, scope change, partial confidentiality loss, high integrity impact, and no availability impact. Microsoft has released an official fix for this vulnerability.
Potential Impact
An attacker can exploit this vulnerability to elevate privileges remotely without authentication, potentially compromising the confidentiality and integrity of the affected system. This could allow unauthorized actions that normally require higher privileges, posing a critical security risk.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. It is recommended to apply the vendor-provided patch promptly to remediate the issue. Since the product is not a cloud service, remediation depends on applying the update to affected installations.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-r9hf-26xj-x88v
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-80098"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
- Remediation Level
- official-fix
- State
- PUBLISHED
Threat ID: 6a9ad4f9acd9273b49b67a8c
Added to database: 09/04/2026, 14:26:01 UTC
Last enriched: 10/08/2026, 22:43:16 UTC
Last updated: 10/18/2026, 18:48:24 UTC
Views: 63
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