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CVE-2026-40372 – Unauthenticated Privilege Escalation via Cryptographic Signature Bypass in ASP.NET Core 10.0

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CVE-2026-40372 is a critical privilege escalation vulnerability (CWE-347: Improper Verification of Cryptographic Signature) affecting ASP.NET Core 10.0 prior to version 10.0.7. An unauthenticated remote attacker can exploit the flaw over the network with no user interaction, potentially bypassing authentication or authorization token validation on any exposed ASP.NET Core web service.

The vulnerability carries a CVSS vector of AV:N/AC:L/PR:N/UI:N, reflecting maximum network exploitability with no prerequisites. Although no public exploit code is currently known, the vulnerability is confirmed by Microsoft with an official fix available. Organizations running ASP.NET Core 10.0 should upgrade to version 10.0.7 or later immediately.

Note: The highlighted "potentially affected" assets are those where IONIX detected Microsoft ASP.NET Core Data Protection (any version). Some may have a version that isn’t affected by this vulnerability.

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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