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

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 8.8
Published: 2026-07-14
Last updated: 2026-07-15
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/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.

Low exploitation riskCVE-2026-473030.74% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-47303	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[NEW] [high] Microsoft DeveloperTools: Multiple vulnerabilitiescert-bund
highGHSA-2p3q-h3hg-jcqq: Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerabilityghsa
unknownUSN-8553-1: .NET vulnerabilitiesubuntu
unknownMultiple vulnerabilities in Microsoft .Net (July 15, 2026)cert-fr-avis
unknownMultiple vulnerabilities in Microsoft products (July 15, 2026)cert-fr-avis
unknownNCSC-2026-0235 [1.00] [M/H] Vulnerabilities fixed in Microsoft Developer Toolsncsc-nl
highCVE-2026-47303: ASP.NET Core Elevation of Privilege Vulnerabilitymsrc

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