NCSC-NL Flags Mass Microsoft Dev Tools Patch
NCSC-NL advisory covers ~49 vulnerabilities in Visual Studio, VSCode, .NET, ASP.NET Core and Azure DevOps, including a 9.9 CVSS remote-code-execution flaw.
Sourceadvisories.ncsc.nl — open the original
What to check
- Applies to
- The 40 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
The Dutch National Cyber Security Center (NCSC-NL) republished Microsoft's patch guidance for a large batch of vulnerabilities affecting its developer tooling ecosystem: Visual Studio, Visual Studio Code (including the GitHub Pull Requests and Issues extension), .NET, .NET Aspire, ASP.NET Core, Azure DevOps and Azure DevOps Server. The bulletin lists roughly 49 CVEs spanning a wide range of weakness classes — buffer overflows, deserialization of untrusted data, SSRF, CSRF, race conditions, improper authorization, and code-injection issues — with impacts ranging from information disclosure and denial-of-service to privilege escalation and arbitrary code execution. The most severe is CVE-2026-109467 in Azure DevOps (CVSS 9.9, remote code execution), followed by CVE-2026-120779 in Visual Studio Code (CVSS 9.6, RCE) and CVE-2026-114146 in ASP.NET Core (CVSS 9.0, privilege escalation). Several Visual Studio and Visual Studio Code CVEs (e.g. CVE-2026-70094, CVE-2026-114151/114152/114158/114159, CVE-2026-118745, CVE-2026-119975) carry CVSS 8.8 and are also rated for arbitrary code execution.
The advisory does not indicate active in-the-wild exploitation; it is a routine aggregation of Microsoft's own fixes, requiring user interaction (such as opening a malicious source file) for some flaws, while others are reachable through a vulnerable application or service without interaction. No proof-of-concept or exploitation details are given. Organizations running any of the listed products — particularly Azure DevOps Server, ASP.NET Core, and Visual Studio/VSCode extensions used broadly by developers — should prioritize patching per Microsoft's security guidance portal, especially for the CVEs rated 8.8 and above where remote code execution or privilege escalation is possible.
Mentioned in this report
Source reporting: https://advisories.ncsc.nl/2026/ncsc-2026-0473.html
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