CVE-2026-123388 Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability
High 7.8
Published
Updated
Check this codebase for CVE-2026-123388 and fix it if it is affected.
What it is: CVE-2026-123388 is a high-severity vulnerability in Microsoft Windows 10 Version 1607, published on 10 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-123388 in the wild and no public exploit code.
Affected product: Microsoft Windows 10 Version 1607. 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-2026-123388/ (Markdown: https://insights.sbomify.com/CVE-2026-123388/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123388?
CVE-2026-123388 is a high-severity vulnerability in Microsoft Windows 10 Version 1607, published on 10 Nov 2026.
Official description
Heap-based buffer overflow in Windows Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.
Which versions are affected by CVE-2026-123388?
How do I fix CVE-2026-123388?
No fix has been published for CVE-2026-123388 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123388 being exploited?
There is no known exploitation of CVE-2026-123388 in the wild and no public exploit code.
Sources
Also known as GHSA-c65x-7666-g6wv.