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CVE-2026-47303: ASP.NET Core Elevation of Privilege Vulnerability

highCVSS 8.8CVE-2026-47303
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

CSIRTS triage

vendor: Microsoftproduct: ASP.NET CoreAuthentication bypassPrivilege escalation
What
Authentication bypass by assumed-immutable data allows an authorized attacker to elevate privileges over a network.
Who is affected
Authorized users of ASP.NET Core applications.
Urgency
Remediation is urgent due to the high severity and potential for privilege escalation.
Action
Apply the latest security patch for ASP.NET Core.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.8
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-47303coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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