CVE-2026-83845 Windows Internet (wininet.dll) Spoofing Vulnerability
High 8.4
Published
Updated
Check this codebase for CVE-2026-83845 and fix it if it is affected.
What it is: CVE-2026-83845 is a high-severity vulnerability in Microsoft Windows 10 21h2, published on 13 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-83845 in the wild and no public exploit code.
Affected product: Microsoft Windows 10 21h2. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-83845/ (Markdown: https://insights.sbomify.com/CVE-2026-83845/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-83845?
CVE-2026-83845 is a high-severity vulnerability in Microsoft Windows 10 21h2, published on 13 Oct 2026.
Official description
Improper privilege management in Windows Internet (wininet.dll) allows an authorized attacker to perform spoofing locally.
Weakness: CWE-290
Which versions are affected by CVE-2026-83845?
It affects 9 products.
Products include Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1 and 3 more.
How do I fix CVE-2026-83845?
No fix has been published for CVE-2026-83845 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-83845 being exploited?
There is no known exploitation of CVE-2026-83845 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 21h2
- CVE-2025-21333 Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow
- CVE-2025-21334 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free
- CVE-2025-21335 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free
- CVE-2026-42904 Windows TCP/IP Elevation of Privilege Vulnerability
- CVE-2026-105733 Windows Hyper-V Remote Code Execution Vulnerability
Sources
Also known as GHSA-pp9h-jmw7-x6cw.