CVE-2026-80098
criticalImproper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.
Vendor / product: Microsoft — copilot studio
Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.
CVSS
10.0
10.0 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-09-03 23:17
Modified: 2026-09-08 17:53
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
microsoft / copilot_studio all versions
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80098
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80098 secure@microsoft.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗