CVE-2026-40372CWE-347

ASP.NET Core Elevation of Privilege Vulnerability

Critical · published April 21, 2026

CVSS v3.1
9.1
EPSS
1%
Percentile
56.9
In the wild
Unconfirmed
What it is

Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.00824 · 56.9th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-04-21T19:20Z
EPSS history
Timeline
  • 25 SEP 03:25Z
    EPSS moved 11% → 1%
    epss
  • 21 APR 19:20Z
    ASP.NET Core Elevation of Privilege Vulnerability
    cvelistv5