by Kastro
Paper/Archive/CVE-2026-40372

CVE-2026-40372

Microsoft ASP.NET Core 10.0 — ASP.NET Core Elevation of Privilege Vulnerability

EPSS 11%CVSS 9.1
critical.is priorityof 100
47
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 95.9.959 × 2019.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

Affected

ProductAffectedFixed inSource
ASP.NET Core 10.010.0 – < 10.0.710.0.7CNA
Microsoft Visual Studio 2026 version 18.518.5.0 – < 18.5.218.5.2CNA
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 8see advisory–redhat-SADP
Red Hat Enterprise Linux 9see advisory–redhat-SADP
Red Hat Hardened Imagessee advisory–redhat-SADP

Scores by source

microsoft (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
redhat-SADP (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

patchmsrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372refaccess.redhat.com/security/cve/CVE-2026-40372refbugzilla.redhat.com/show_bug.cgi?id=2460224refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.json