9.1

CVE-2026-40372: microsoft asp.net_core

CVSS: 9.1v3.1CriticalModified
AliasesUBUNTU-CVE-2026-40372GHSA-9mv3-2cwr-p262BIT-aspnet-core-2026-40372
Published 21-04-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-40372 is a critical (CVSS 9.1) vulnerability in microsoft asp.net_core. EPSS estimates a 0.82% chance of exploitation in the next 30 days, higher than 56.6% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.82%
0%100%
Low · -10.38 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 2
USN-8215-1USN-8216-1

Timeline

  1. 21-04-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.82%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

-10.38 pp

From 11.21% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.82%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft3 products
Ubuntu2 products
  • dotnet10< 10.0.107-10.0.7-0ubuntu1~24.04.1 | < 10.0.107-10.0.7-0ubuntu1~25.10.1 | < 10.0.107-10.0.7-0ubuntu1~26.04.1
  • dotnet7All versions (No fix recorded)
NuGet1 product
  • Microsoft.AspNetCore.DataProtection≥ 10.0.0, < 10.0.7

3 vendors · 6 products

References

13 links
Show all 13 references