CVE-2026-80098CWE-347

CVE-2026-80098

Critical · published September 4, 2026

CVSS v3.1
9.3
EPSS
0%
Percentile
41.0
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
9.3 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00488 · 41.0th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-09-04T03:17Z
Affected products (1)
ProductVersionsFixed in
microsoft/copilot_studioall versions—
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80098 · [email protected]
EPSS history
Timeline
  • 05 SEP 03:44Z
    EPSS moved — → 0%
    epss
  • 03 SEP 22:59Z
    Copilot Studio Elevation of Privilege Vulnerability
    cvelistv5