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.NET
.NET NuGet
Not in CISA KEV
HIGH severity

Open redirect in ASP.NET CoreGHSA-3wcj-rg8q-9cqv

HIGH

GHSA-3wcj-rg8q-9cqv is a high-severity (CVSS 8.8) Open Redirect vulnerability in Microsoft.AspNetCore.All. A fix is available for Microsoft.AspNetCore.All — see the affected versions and patch details below.

Also known asCVE-2017-11879
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
9.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs95th percentile — riskier than 95% of all scored CVEsHighest risk
8.90%9.36%9.81%10.3%9.8%9.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
.NETMicrosoft.AspNetCore.All.NETMicrosoft.AspNetCore.Mvc.Core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

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".

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetMicrosoft.AspNetCore.All≥ 2.0.0&&< 2.0.32.0.3dotnet add package Microsoft.AspNetCore.All --version 2.0.3
.NETNuGetMicrosoft.AspNetCore.Mvc.Core≥ 2.0.0&&< 2.0.12.0.1dotnet add package Microsoft.AspNetCore.Mvc.Core --version 2.0.1

Affected Products

1 product · 1 configurations
Application
asp.net coremicrosoft
1 version
2.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Microsoft.AspNetCore.All, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update Microsoft.AspNetCore.All to 2.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3wcj-rg8q-9cqv is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Frequently Asked Questions

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".
O3 Security · Impact-Aware SCA

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Open redirect in ASP.NET Core (High 8.8)