CVE-2026-80098

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

CVSS v3 9.3 CRITICAL

9.3^/10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80098	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:microsoft:copilot_studio:-:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-09-03 23:17

Updated : 2026-09-08 17:53

NVD link : CVE-2026-80098

Mitre link : CVE-2026-80098

CVE.ORG link : CVE-2026-80098

JSON object : View

Products Affected

microsoft

copilot_studio

CWE

CWE-347

Improper Verification of Cryptographic Signature

{"id": "CVE-2026-80098", "cveTags": [{"tags": ["exclusively-hosted-service"], "sourceIdentifier": "secure@microsoft.com"}], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-80098", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-09-04T00:00:00+00:00"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.3, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 4.7, "exploitabilityScore": 3.9}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 10.0, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 3.9}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Microsoft Copilot Studio", "versions": [{"status": "affected", "version": "-"}]}]}], "published": "2026-09-03T23:17:20.350", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80098", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-347"}]}], "descriptions": [{"lang": "en", "value": "Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network."}], "lastModified": "2026-09-08T17:53:07.297", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:copilot_studio:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7859CFCD-C125-4992-9DCD-A843175DF9BE"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}