CVE-2017-8700
Cross-origin Resource Sharing bypass in ASP.NET Core
ASP.NET Core 1.0, 1.1, and 2.0 allow an attacker to bypass Cross-origin Resource Sharing (CORS) configurations and retrieve normally restricted content from a web application, aka "ASP.NET Core Information Disclosure Vulnerability".
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
ASP.NET Core 1.0, 1.1, and 2.0 allow an attacker to bypass Cross-origin Resource Sharing (CORS) configurations and retrieve normally restricted content from a web application, aka "ASP.NET Core Information Disclosure Vulnerability".
- Record
CVE-2017-8700- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Updated
- 2026-11-02
CVE List No score
ASP.NET Core 1.0, 1.1, and 2.0 allow an attacker to bypass Cross-origin Resource Sharing (CORS) configurations and retrieve normally restricted content from a web application, aka "ASP.NET Core Information Disclosure Vulnerability".
- Record
CVE-2017-8700- Updated
- 2026-11-02
EUVDEUVD-2022-2236 No score
ASP.NET Core 1.0, 1.1, and 2.0 allow an attacker to bypass Cross-origin Resource Sharing (CORS) configurations and retrieve normally restricted content from a web application, aka "ASP.NET Core Information Disclosure Vulnerability".
- Record
EUVD-2022-2236- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-3rp6-rjw4-cq39
Cross-origin Resource Sharing bypass in ASP.NET Core
ASP.NET Core 1.0, 1.1, and 2.0 allow an attacker to bypass Cross-origin Resource Sharing (CORS) configurations and retrieve normally restricted content from a web application, aka "ASP.NET Core Information Disclosure Vulnerability".
- Record
GHSA-3rp6-rjw4-cq39- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSV
ASP.NET Core 1.0, 1.1, and 2.0 allow an attacker to bypass Cross-origin Resource Sharing (CORS) configurations and retrieve normally restricted content from a web application, aka "ASP.NET Core Information Disclosure Vulnerability".
- Record
CVE-2017-8700- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-3rp6-rjw4-cq39
Cross-origin Resource Sharing bypass in ASP.NET Core
ASP.NET Core 1.0, 1.1, and 2.0 allow an attacker to bypass Cross-origin Resource Sharing (CORS) configurations and retrieve normally restricted content from a web application, aka "ASP.NET Core Information Disclosure Vulnerability".
- Record
GHSA-3rp6-rjw4-cq39- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
Microsoft.AspNetCore.Mvc.CoreNuGet |
1.0.0 up to 1.0.6 | 1.0.6 |
Microsoft.AspNetCore.Mvc.CoreNuGet |
1.1.0 up to 1.1.6 | 1.1.6 |
Microsoft.AspNetCore.Mvc.CorsNuGet |
1.0.0 up to 1.0.6 | 1.0.6 |
Microsoft.AspNetCore.Mvc.CorsNuGet |
1.1.0 up to 1.1.6 | 1.1.6 |
Microsoft.AspNetCore.Mvc.CoreNuGet |
1.0.0 up to 1.0.6, plus listed versions 1.0.11.0.21.0.31.0.41.0.5 |
1.0.6 |
Microsoft.AspNetCore.Mvc.CoreNuGet |
1.1.0 up to 1.1.6, plus listed versions 1.1.11.1.21.1.31.1.41.1.5 |
1.1.6 |
Microsoft.AspNetCore.Mvc.CorsNuGet |
1.0.0 up to 1.0.6, plus listed versions 1.0.11.0.21.0.31.0.41.0.5 |
1.0.6 |
Microsoft.AspNetCore.Mvc.CorsNuGet |
1.1.0 up to 1.1.6, plus listed versions 1.1.11.1.21.1.31.1.41.1.5 |
1.1.6 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2017-8700 is a high vulnerability (CVSS 7.5) in Microsoft Asp.net Core, published November 15, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 10.4%, the 95th percentile. Fixed in Microsoft.AspNetCore.Mvc.Core 1.0.6.