CVE-2021-43896 Microsoft PowerShell Spoofing Vulnerability
Medium 5.5
Published
Updated
Check this codebase for CVE-2021-43896 and fix it if it is affected.
What it is: CVE-2021-43896 is a medium-severity vulnerability in Microsoft CBL Mariner 1.0 ARM, published on 15 Dec 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-43896 in the wild and no public exploit code.
Affected packages and fixed versions:
- powershell (Bitnami): affected from 7.2.0; fixed in 7.2.1
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-2021-43896/ (Markdown: https://insights.sbomify.com/CVE-2021-43896/index.md)
Attackers can spoof PowerShell content, potentially misleading users or bypassing security checks in Microsoft PowerShell environments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-43896?
CVE-2021-43896 is a medium-severity vulnerability in Microsoft CBL Mariner 1.0 ARM, published on 15 Dec 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Microsoft PowerShell Spoofing Vulnerability
Which versions are affected by CVE-2021-43896?
1 open source package ship an affected version, including powershell. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
powershell Bitnami | From 7.2.0 | 7.2.1 |
Products include Microsoft Powershell.
How do I fix CVE-2021-43896?
Upgrade powershell to 7.2.1 or later.
Is CVE-2021-43896 being exploited?
There is no known exploitation of CVE-2021-43896 in the wild and no public exploit code.
Other vulnerabilities in Microsoft CBL Mariner 1.0 ARM
- CVE-2018-8327 Code injection in PowerShell Editor
- CVE-2026-96251 Microsoft PowerShell Remote Code Execution Vulnerability
- CVE-2026-70337 Microsoft PowerShell Remote Code Execution Vulnerability
- CVE-2022-41076 PowerShell Remote Code Execution Vulnerability
- CVE-2026-50523 Microsoft PowerShell Remote Code Execution Vulnerability
Sources
Also known as AZL-7049, BIT-powershell-2021-43896, GHSA-2w8h-77mr-j4fw.