CVE-2026-62872: .NET Framework Elevation of Privilege Vulnerability

highCVSS 8.8CVE-2026-62872

Incorrect authorization in .NET Framework allows an authorized attacker to elevate privileges over a network.

CSIRTS triage

vendor: Microsoft product: .NET Framework Privilege escalation Authentication bypass

What: An incorrect authorization check in .NET Framework allows privilege escalation over a network.
Who is affected: Authorized attackers with network access to systems running affected .NET Framework versions.
Urgency: Critical severity (CVSS 8.8) with network exploitation capability; prioritize patching immediately.
Action: Apply the latest .NET Framework security update addressing CVE-2026-62872 urgently.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.8
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62872

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-2026-628720.53% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-62872	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 Developer Tools: Multiple Vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Microsoft .Net (August 12, 2026)cert-fr-avis
unknownNCSC-2026-0285 [1.00] [M/H] Vulnerabilities patched in Microsoft Developer Toolsncsc-nl
highCVE-2026-62872: Incorrect authorization in .NET Framework allows an authorized attacker to elevate privileges …nvd

Recent advisories for .NET Framework Elevation

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-65810: Relative path traversal in .NET Framework allows an unauthorized attacker to elevate privilege…nvd · 2026-08-11
highCVE-2026-62872: Incorrect authorization in .NET Framework allows an authorized attacker to elevate privileges …nvd · 2026-08-11
highCVE-2026-65810: .NET Framework Elevation of Privilege Vulnerabilitymsrc · 2026-08-11
highCVE-2026-50650: Improper control of generation of code ('code injection') in .NET Framework allows an unauthor…nvd · 2026-07-14
highCVE-2026-50650: .NET Framework Elevation of Privilege Vulnerabilitymsrc · 2026-07-14