CVE-2021-40483 Microsoft SharePoint Server Spoofing Vulnerability
High 7.6
Published
Updated
Check this codebase for CVE-2021-40483 and fix it if it is affected.
What it is: CVE-2021-40483 is a high-severity vulnerability in Microsoft Sharepoint Server, published on 13 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-40483 in the wild and no public exploit code.
Affected product: Microsoft Sharepoint Server. 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-2021-40483/ (Markdown: https://insights.sbomify.com/CVE-2021-40483/index.md)
An attacker can spoof content in Microsoft SharePoint Server, potentially misleading users about the source or integrity of information.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-40483?
CVE-2021-40483 is a high-severity vulnerability in Microsoft Sharepoint Server, published on 13 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Microsoft SharePoint Server Spoofing Vulnerability
Which versions are affected by CVE-2021-40483?
It affects 1 product.
Products include Microsoft Sharepoint Server.
How do I fix CVE-2021-40483?
No fix has been published for CVE-2021-40483 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-40483 being exploited?
There is no known exploitation of CVE-2021-40483 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sharepoint Server
- CVE-2026-50522 Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
- CVE-2026-58644 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2026-20963 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2025-53770 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2023-29357 Microsoft SharePoint Server Privilege Escalation
Sources
Also known as GHSA-vfcg-x845-wx2v.