CRITICAL: CVE-2026-40372 (CVSS 9.1) — microsoft asp.net core

CVE: CVE-2026-40372

CVSS: 9.1 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Severity: CRITICAL

Status: Critical advisory

Affected

microsoft asp.net core

Summary

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

Verified Sources

NVD entry
GitHub Advisory
MITRE

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._

Lyrie Verdict

A vulnerability of this severity is exactly what Lyrie's anti-rogue-AI defense is built for: continuous, autonomous monitoring that doesn't wait for human reaction time.

#microsoft #critical

Validated sources

[1]NVD
[2]GitHub Advisory
[3]MITRE