# CVE-2026-33113: Microsoft SharePoint Server Spoofing Vulnerability

> An unauthorized attacker can perform spoofing via cross-site scripting in Microsoft SharePoint Server, requiring a vendor patch.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 9 Jun 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-fq8f-fjfp-487h

## What is CVE-2026-33113?

CVE-2026-33113 is a medium-severity cross-site scripting vulnerability in Microsoft Sharepoint Server, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-33113?

It affects 1 product.


Products: Microsoft Sharepoint Server.

## How do I fix CVE-2026-33113?

No fix has been published for CVE-2026-33113 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-33113 being exploited?

There is no known exploitation of CVE-2026-33113 in the wild and no public exploit code.

## 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-2026-33113 and fix it if it is affected.

What it is: CVE-2026-33113 is a medium-severity cross-site scripting vulnerability in Microsoft Sharepoint Server, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-33113 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-2026-33113/ (Markdown: https://insights.sbomify.com/CVE-2026-33113/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33113
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33113
- OSV: https://osv.dev/vulnerability/CVE-2026-33113

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33113/
Summaries are generated and may contain mistakes; the official description above is the record.