NCSC-2026-0285 [1.00] [M/H] Vulnerabilities patched in Microsoft Developer Tools

CSIRTS triage

What

Vulnerabilities in Visual Studio Code CoPilot Chat Extension and Microsoft PowerShell Core allow security feature bypass and unauthorized data access.

Who is affected

Users of Visual Studio Code with CoPilot Chat Extension and Microsoft PowerShell Core are affected; exploitation requires processing malicious source code.

Urgency

Moderate-to-high—CVSS scores range from 7.1 to 8.8 and exploitation requires social engineering.

Action

Apply patches to Visual Studio Code CoPilot Chat Extension and PowerShell Core as available.

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

Details

Source

NCSC-NL Advisories (NL · national-cert · site)

Severity

unknown

Published

2026-08-11

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://advisories.ncsc.nl/advisory?id=NCSC-2026-0285

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-2026-656750.48% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-586120.80% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-703370.76% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-703350.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-586500.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-591130.71% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-472850.89% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 56% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-693200.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-692780.33% 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-2026-693060.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.

Referenced CVEs

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 products (August 12, 2026)cert-fr-avis
• unknownMultiple vulnerabilities in Microsoft .Net (August 12, 2026)cert-fr-avis
• mediumGHSA-9mrh-pw7c-9mqm: Microsoft Security Advisory CVE-2026-62902 – .NET Information Disclosure Vulnerabilityghsa
• highGHSA-vg44-h755-9hw7: Microsoft Security Advisory CVE-2026-62871 – .NET Elevation of Privilege Vulnerabilityghsa
• highGHSA-fx4q-gjrx-2jw6: Microsoft Security Advisory CVE-2026-62897 – .NET Remote Code Execution Vulnerabilityghsa
• highGHSA-gg8c-3338-xw2f: Microsoft Security Advisory CVE-2026-70354 – .NET Core Remote Code Execution Vulnerabilit…ghsa
• mediumGHSA-9mr8-pwpw-3j2w: Microsoft Security Advisory CVE-2026-62909 – .NET Elevation of Privilege Vulnerabilityghsa
• highGHSA-jqhp-238x-qhgf: Microsoft Security Advisory CVE-2026-62886 – .NET Elevation of Privilege Vulnerabilityghsa
• highGHSA-m93f-wj8c-rp8p: Microsoft Security Advisory CVE-2026-62901 – .NET Denial of Service Vulnerabilityghsa
• mediumGHSA-r6mh-95jw-g7qg: Microsoft Security Advisory CVE-2026-62899 – .NET Security Feature Bypass Vulnerabilityghsa
• highCVE-2026-70354: Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.nvd

Recent advisories for Microsoft Developer Tools

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.

• high[NEW] [high] Microsoft Developer Tools: Multiple Vulnerabilitiescert-bund · 2026-08-14
• high[UPDATE] [high] Microsoft Developer Tools: Multiple Vulnerabilitiescert-bund · 2026-07-28
• unknownNCSC-2026-0235 [1.00] [M/H] Vulnerabilities fixed in Microsoft Developer Toolsncsc-nl · 2026-07-14

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