# CVE-2026-118741: ASP.NET Core improper authentication privilege elevation

Source: https://junglewise.ai/threats/cve-2026-118741-improper-authentication-in-asp-net-core-allows-an-unauthorized  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-118741 · Severity: high · CVSS 8.1 · Published 2026-11-10

ASP.NET Core, a framework for building web applications, contains an authentication flaw that allows an attacker to bypass access controls and gain elevated privileges. An attacker on the network can exploit this vulnerability without valid credentials to gain unauthorized access to sensitive functionality or data.

Technologies: [Microsoft Asp.Net Core](https://junglewise.ai/threats/technologies/asp-net-core). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-118741 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-118741 being exploited in the wild.

**How severe is CVE-2026-118741?** High severity, with a CVSS score of 8.1, published 10 November 2026.

**Which products and versions are affected?** Microsoft ASP.NET Core.

**Is there a fix for CVE-2026-118741?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-118741 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-118741?** Check whether you run Microsoft Asp.Net Core. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability stems from improper authentication validation in ASP.NET Core, allowing an attacker to escalate privileges through network-based attack vectors without requiring prior authentication. The flaw permits unauthorized access to protected resources and administrative functions. A fix is available from Microsoft.

## Affected products

- Microsoft ASP.NET Core

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118741](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118741)

## Related threats

- [Microsoft ASP.NET Core race condition privilege escalation](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-asp-net-core-security-04275796)
- [Microsoft ASP.NET Core denial of service via resource consumption](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-asp-net-core-denial-of-0f1476a7)
- [ASP.NET Core security feature bypass via input validation](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-asp-net-core-security-942d98c7)
- [ASP.NET Core inefficient algorithmic complexity denial of service](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-asp-net-core-denial-of-f3e14a11)
- [Microsoft ASP.NET Core denial of service via resource allocation](https://junglewise.ai/threats/cve-2026-118750-allocation-of-resources-without-limits-or-throttling-in-asp-net)