CVE-2026-40372
ASP.NET Core Elevation of Privilege Vulnerability
No exploitation reported by the sources we read.
- Published2026-04-21
- Fixed in10.0.7
- WeaknessCWE-347
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
Timeline
dates in UTC- 2026-04-2120:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-25 15:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-40372?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-40372?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 10.0 | ≥ 10.0.0, < 10.0.7 | 10.0.7 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
- CVE-2026-40372 Red Hat Product Security
ASP.NET Core: ASP.NET: ASP.NET Core: Privilege escalation via improper cryptographic signature verification
Fix
- Update ASP.NET Core to 10.0.7
Advisories and patches
- msrc.microsoft.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVE recordread 2026-10-23
- CISA-ADPSSVC decisionnone2026-04-21
- OpenCVESSVC decisionnone—
- CNACVSS 3.19.1read 2026-10-23
- CNAweakness (CWE)CWE-347read 2026-10-23
- FIRST EPSSEPSS score11.2 %2026-10-25
- OSVaffected packages—
- Microsoft MSRCadvisory—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Published
- 2026-04-21
- Last Modified
- 2026-07-15
- NVD status
- Modified
- MSRC Title
- ASP.NET Core Elevation of Privilege Vulnerability
Frequently asked questions
What is CVE-2026-40372?
Is CVE-2026-40372 actively exploited?
What is the CVSS score for CVE-2026-40372?
Running ASP.NET Core? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.