CVE-2021-26434 Visual Studio Elevation of Privilege Vulnerability
High 7.8
Published
Updated
Check this codebase for CVE-2021-26434 and fix it if it is affected.
What it is: CVE-2021-26434 is a high-severity vulnerability in Microsoft Visual Studio 2017, published on 15 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-26434 in the wild and no public exploit code.
Affected product: Microsoft Visual Studio 2017. 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-2021-26434/ (Markdown: https://insights.sbomify.com/CVE-2021-26434/index.md)
An attacker can exploit improper access controls in Visual Studio to elevate privileges on the local system.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-26434?
CVE-2021-26434 is a high-severity vulnerability in Microsoft Visual Studio 2017, published on 15 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Visual Studio Elevation of Privilege Vulnerability
Weakness: CWE-732
Which versions are affected by CVE-2021-26434?
It affects 2 products.
Products include Microsoft Visual Studio 2017, Microsoft Visual Studio 2019.
How do I fix CVE-2021-26434?
No fix has been published for CVE-2021-26434 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-26434 being exploited?
There is no known exploitation of CVE-2021-26434 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Visual Studio 2017
- CVE-2025-21178 Visual Studio Remote Code Execution Vulnerability
- CVE-2019-1349 Code injection in Microsoft Visual Studio 2017
- CVE-2019-1350 Code injection in Microsoft Visual Studio 2017
- CVE-2019-1352 Code injection in Microsoft Visual Studio 2017
- CVE-2019-1354 Code injection in Microsoft Visual Studio 2017
Sources
Also known as GHSA-8qhp-jq8m-c4m4.