CVE-2023-21743 Microsoft SharePoint Server Security Feature Bypass Vulnerability
Medium 5.3
Published
Updated
Check this codebase for CVE-2023-21743 and fix it if it is affected.
What it is: CVE-2023-21743 is a medium-severity vulnerability in Microsoft Sharepoint Server, published on 10 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-21743 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-2023-21743/ (Markdown: https://insights.sbomify.com/CVE-2023-21743/index.md)
Attackers can bypass security features in Microsoft SharePoint Server, potentially undermining access controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-21743?
CVE-2023-21743 is a medium-severity vulnerability in Microsoft Sharepoint Server, published on 10 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Microsoft SharePoint Server Security Feature Bypass Vulnerability
Weakness: CWE-306
Which versions are affected by CVE-2023-21743?
It affects 1 product.
Products include Microsoft Sharepoint Server.
How do I fix CVE-2023-21743?
No fix has been published for CVE-2023-21743 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-21743 being exploited?
There is no known exploitation of CVE-2023-21743 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-j736-7m9g-xp23.