Unauthenticated security bypass via HTTP request smuggling
Published Oct 13, 2026 · Updated Oct 13, 2026
HTTP request smuggling in Microsoft Corporation ASP.NET Core allows remote attackers to bypass a security feature over a network. The CNA identifies inconsistent HTTP request interpretation but does not disclose the parser, conflicting request syntax, or security feature involved. Authentication is not required; the deployment prerequisites and specific data access enabled by the bypass remain undisclosed.
Summary
What happened
HTTP request smuggling in Microsoft Corporation ASP.NET Core allows remote attackers to bypass a security feature over a network. The CNA identifies inconsistent HTTP request interpretation but does not disclose the parser, conflicting request syntax, or security feature involved. Authentication is not required; the deployment prerequisites and specific data access enabled by the bypass remain undisclosed.
The record
- CVE
- CVE-2026-70188
- Published
- Oct 13, 2026
- Updated
- Oct 13, 2026
- Vendor
- Microsoft Corporation
- Product
- ASP.NET Core 8.0
- Classifications
- CWE-444
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 13, 2026CVE publishedPublication date reported by the CVE source.
- Oct 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=8.0 <8.0.32
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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