CVE-2026-80098: CWE-347: Improper Verification of Cryptographic Signature in Microsoft Microsoft Copilot Studio
Description
Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.
CVSS v3.1
Score 9.3critical
Affected software
Microsoft
Microsoft Copilot Studio
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-80098 is a vulnerability classified as CWE-347 (Improper Verification of Cryptographic Signature) affecting Microsoft Copilot Studio. The flaw allows an attacker to elevate privileges remotely by exploiting improper cryptographic signature verification. The vulnerability is network exploitable without requiring user interaction and can lead to a complete compromise of integrity with limited confidentiality impact. Microsoft has published an official fix for this issue.
Potential Impact
An attacker can remotely elevate privileges on affected Microsoft Copilot Studio installations by exploiting improper cryptographic signature verification. This could lead to unauthorized actions with elevated privileges, impacting system integrity. Confidentiality impact is limited, and availability is not affected.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the provided patch as soon as possible to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-25T18:37:59.830Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80098","vendor":"Microsoft"}]
Threat ID: 6a99fdbeacd9273b4999b6b1
Added to database: 09/03/2026, 23:07:42 UTC
Last enriched: 10/13/2026, 20:52:46 UTC
Last updated: 10/17/2026, 06:48:20 UTC
Views: 134
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