# CVE-2026-65660: Microsoft SharePoint Code Injection

> An authorized attacker can execute arbitrary code remotely on Microsoft SharePoint Server via improper code generation control.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Yes, since 25 Sep 2026 (CISA KEV)
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Aug 2026
- **Updated:** 28 Oct 2026
- **Also known as:** GHSA-r94x-x846-rxqx

## What is CVE-2026-65660?

CVE-2026-65660 is a high-severity code injection vulnerability in Microsoft Sharepoint Server, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-65660?

It affects 1 product.


Products: Microsoft Sharepoint Server.

## How do I fix CVE-2026-65660?

No fix has been published for CVE-2026-65660 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 28 Sep 2026.

## Is CVE-2026-65660 being exploited?

Yes. Attackers have exploited CVE-2026-65660 in the wild since at least 25 Sep 2026.

Public exploit code:

- Malicious Register Directive Code Injection Exploit (github_poc): https://github.com/ShadowForge-Cyber/CVE-2026-65660-Poc
- CVE-2026-65660 - Draft or TODO (github_poc): https://github.com/HORKimhab/CVE-2026-65660

## Other vulnerabilities in Microsoft Sharepoint Server

- [CVE-2026-50522](https://insights.sbomify.com/CVE-2026-50522/): Microsoft SharePoint Deserialization of Untrusted Data Vulnerability (critical 9.8, exploited in the wild)
- [CVE-2026-58644](https://insights.sbomify.com/CVE-2026-58644/): Microsoft SharePoint Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2026-20963](https://insights.sbomify.com/CVE-2026-20963/): Microsoft SharePoint Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2025-53770](https://insights.sbomify.com/CVE-2025-53770/): Microsoft SharePoint Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2023-29357](https://insights.sbomify.com/CVE-2023-29357/): Microsoft SharePoint Server Privilege Escalation (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-65660 and fix it if it is affected.

What it is: CVE-2026-65660 is a high-severity code injection vulnerability in Microsoft Sharepoint Server, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-65660 in the wild since at least 25 Sep 2026.

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-2026-65660/ (Markdown: https://insights.sbomify.com/CVE-2026-65660/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-65660
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-65660
- OSV: https://osv.dev/vulnerability/CVE-2026-65660

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-65660/
Summaries are generated and may contain mistakes; the official description above is the record.