[NEW] [high] Microsoft Dynamics: Multiple vulnerabilities

highCVE-2026-66301 CVE-2026-65815 CVE-2026-59118 CVE-2026-40375

A remote, authenticated attacker can exploit multiple vulnerabilities in Microsoft Dynamics 365 to execute arbitrary code or disclose confidential information.

CSIRTS triage

vendor: Microsoft product: Dynamics 365 Remote code execution Information disclosure

What: Multiple vulnerabilities in Microsoft Dynamics 365 enable arbitrary code execution and information disclosure.
Who is affected: Authenticated users of Dynamics 365 can exploit these vulnerabilities.
Urgency: High priority due to severity; requires authenticated access but enables code execution.
Action: Apply Microsoft security patches for Dynamics 365 immediately.

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

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-08-14
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2783

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-2026-663010.68% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-658150.91% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 57% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-591180.39% 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-2026-403750.77% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 53% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-66301	coverage & exploitation status	NVD · CVE.org
CVE-2026-65815	coverage & exploitation status	NVD · CVE.org
CVE-2026-59118	coverage & exploitation status	NVD · CVE.org
CVE-2026-40375	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 Dynamics

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.

unknownNCSC-2026-0288 [1.00] [M/H] Vulnerabilities patched in Microsoft Dynamicsncsc-nl · 2026-08-11
mediumCVE-2026-66301: Exposure of sensitive information to an unauthorized actor in Microsoft Dynamics 365 (on-premi…nvd · 2026-08-11
highCVE-2026-65815: Deserialization of untrusted data in Microsoft Dynamics 365 (on-premises) allows an authorized…nvd · 2026-08-11
mediumCVE-2026-66301: Microsoft Dynamics 365 (On-Premises) Information Disclosure Vulnerabilitymsrc · 2026-08-11
highCVE-2026-65815: Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerabilitymsrc · 2026-08-11
mediumCVE-2026-40375: Microsoft Dynamics Business Central Information Disclosure Vulnerabilitymsrc · 2026-08-11