CVE-2017-11879 Open redirect in ASP.NET Core
Attackers can steal session cookies or tokens via crafted URLs, potentially leading to account takeover in ASP.NET Core applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2017-11879?
CVE-2017-11879 is a high-severity vulnerability in Microsoft Corporation ASP.NET Core, published on 15 Nov 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
ASP.NET Core 2.0 allows an attacker to steal log-in session information such as cookies or authentication tokens via a specially crafted URL aka "ASP.NET Core Elevation Of Privilege Vulnerability".
Weakness: CWE-601
Which versions are affected by CVE-2017-11879?
4 open source packages ship an affected version, including Microsoft.AspNetCore.All and Microsoft.AspNetCore.Mvc.Core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.AspNetCore.All NuGet | From 2.0.0 | 2.0.3 |
Microsoft.AspNetCore.All NuGet | From 2.0.0 | 2.0.3 |
Microsoft.AspNetCore.Mvc.Core NuGet | From 2.0.0 | 2.0.1 |
Microsoft.AspNetCore.Mvc.Core NuGet | From 2.0.0 | 2.0.1 |
Products include Microsoft Asp.net Core.
How do I fix CVE-2017-11879?
Upgrade Microsoft.AspNetCore.All to 2.0.3 or later.
Is CVE-2017-11879 being exploited?
There is no known exploitation of CVE-2017-11879 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Corporation ASP.NET Core
- CVE-2025-55315 ASP.NET Security Feature Bypass Vulnerability
- CVE-2026-88092 ASP.NET Core Tampering Vulnerability
- CVE-2026-40372 ASP.NET Core Elevation of Privilege Vulnerability
- CVE-2021-43877 ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability
- CVE-2020-0603 Remote code execution in ASP.NET Core
Sources
Also known as GHSA-3wcj-rg8q-9cqv.