Vulnerability details
CVE-2026-70188
Microsoft ASP.NET CoreMicrosoft Visual Studio
ASP.NET Core Security Feature Bypass Vulnerability
CVSS 3.1
9.1Critical
Official description
Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 3.1 | CVEProject cvelistV5 (CNA) (microsoft) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Microsoft | ASP.NET Core 10.0 | 10.0 ≤ v < 10.0.13 | CVEProject cvelistV5 (CNA) |
| Microsoft | ASP.NET Core 11.0 | 11.0 ≤ v < 11.0.0-rc.2 | CVEProject cvelistV5 (CNA) |
| Microsoft | ASP.NET Core 8.0 | 8.0 ≤ v < 8.0.32 | CVEProject cvelistV5 (CNA) |
| Microsoft | ASP.NET Core 9.0 | 9.0 ≤ v < 9.0.21 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 ≤ v < 17.14.42 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft Visual Studio 2026 version 18.10 | 18.10.0 ≤ v < 18.10.4 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70188 vendor-advisorypatch
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Details
- Published
- 2026-10-13
- Last updated
- 2026-10-31
- State
- Published
- Assigner (CNA)
- microsoft
- Kolun priority
- 39 · Medium
Exploit prediction (EPSS)
0.93%
Probability of exploitation in 30 days
61%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')