Multiple vulnerabilities in Microsoft .Net (August 12, 2026)

unknownCVE-2026-65810 CVE-2026-62897 CVE-2026-70354 CVE-2026-58641 CVE-2026-62909 CVE-2026-62902

Multiple vulnerabilities have been discovered in Microsoft .Net. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

CSIRTS triage

vendor: Microsoft product: .NET Remote code execution Privilege escalation Denial of service

What: Multiple vulnerabilities in Microsoft .NET enable remote code execution, privilege escalation, and denial of service.
Who is affected: Applications built on Microsoft .NET framework versions affected by the listed CVEs.
Urgency: Highly urgent; .NET runtime vulnerabilities affect all dependent applications and require immediate patching.
Action: Update Microsoft .NET runtime and libraries to patched versions from the August 2026 security release.

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

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Details

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-08-12
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1002/

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-2026-658100.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-628970.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-703540.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-586410.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-629090.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-629020.76% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-628981.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 63% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-629011.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 62% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-629000.55% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-628860.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-65810	coverage & exploitation status	NVD · CVE.org
CVE-2026-62897	coverage & exploitation status	NVD · CVE.org
CVE-2026-70354	coverage & exploitation status	NVD · CVE.org
CVE-2026-58641	coverage & exploitation status	NVD · CVE.org
CVE-2026-62909	coverage & exploitation status	NVD · CVE.org
CVE-2026-62902	coverage & exploitation status	NVD · CVE.org
CVE-2026-62898	coverage & exploitation status	NVD · CVE.org
CVE-2026-62901	coverage & exploitation status	NVD · CVE.org
CVE-2026-62900	coverage & exploitation status	NVD · CVE.org
CVE-2026-62886	coverage & exploitation status	NVD · CVE.org
CVE-2026-62871	coverage & exploitation status	NVD · CVE.org
CVE-2026-62899	coverage & exploitation status	NVD · CVE.org
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.

Recent advisories for Microsoft .Net

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.

mediumGHSA-9mrh-pw7c-9mqm: Microsoft Security Advisory CVE-2026-62902 – .NET Information Disclosure Vulnerabilityghsa · 2026-08-11
highGHSA-vg44-h755-9hw7: Microsoft Security Advisory CVE-2026-62871 – .NET Elevation of Privilege Vulnerabilityghsa · 2026-08-11
highGHSA-fx4q-gjrx-2jw6: Microsoft Security Advisory CVE-2026-62897 – .NET Remote Code Execution Vulnerabilityghsa · 2026-08-11
highGHSA-gg8c-3338-xw2f: Microsoft Security Advisory CVE-2026-70354 – .NET Core Remote Code Execution Vulnerabilit…ghsa · 2026-08-11
mediumGHSA-9mr8-pwpw-3j2w: Microsoft Security Advisory CVE-2026-62909 – .NET Elevation of Privilege Vulnerabilityghsa · 2026-08-11
highGHSA-jqhp-238x-qhgf: Microsoft Security Advisory CVE-2026-62886 – .NET Elevation of Privilege Vulnerabilityghsa · 2026-08-11