# CVE-2026-34327: Microsoft Partner Center Spoofing Vulnerability

> An attacker can exploit externally controlled references to perform spoofing attacks against Microsoft Partner Center users.

- **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:** Not needed
- **Fix available:** No
- **Published:** 7 May 2026
- **Updated:** 10 Aug 2026
- **Also known as:** GHSA-jvw8-2m5m-9449

## What is CVE-2026-34327?

CVE-2026-34327 is a high-severity vulnerability in Microsoft Partner Center, published on 7 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Externally controlled reference to a resource in another sphere in Microsoft Partner Center allows an unauthorized attacker to perform spoofing over a network.

Weakness: CWE-610 (Externally Controlled Reference to a Resource in Another Sphere)

## Which versions are affected by CVE-2026-34327?

It affects 1 product.


Products: Microsoft Partner Center.

## How do I fix CVE-2026-34327?

No fix has been published for CVE-2026-34327 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-34327 being exploited?

There is no known exploitation of CVE-2026-34327 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Partner Center

- [CVE-2024-49035](https://insights.sbomify.com/CVE-2024-49035/): Microsoft Partner Center Improper Access Control (high 8.7, exploited in the wild)
- [CVE-2026-96207](https://insights.sbomify.com/CVE-2026-96207/): Microsoft Partner Center Elevation of Privilege Vulnerability (critical 10.0)
- [CVE-2025-65041](https://insights.sbomify.com/CVE-2025-65041/): Microsoft Partner Center Elevation of Privilege Vulnerability (critical 10.0)
- [CVE-2026-24303](https://insights.sbomify.com/CVE-2026-24303/): Microsoft Partner Center Elevation of Privilege Vulnerability (critical 9.6)
- [CVE-2025-29814](https://insights.sbomify.com/CVE-2025-29814/): Microsoft Partner Center Elevation of Privilege Vulnerability (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34327 and fix it if it is affected.

What it is: CVE-2026-34327 is a high-severity vulnerability in Microsoft Partner Center, published on 7 May 2026. 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-2026-34327 in the wild and no public exploit code.

Affected product: Microsoft Partner Center. 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-2026-34327/ (Markdown: https://insights.sbomify.com/CVE-2026-34327/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34327
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34327
- OSV: https://osv.dev/vulnerability/CVE-2026-34327

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34327/
Summaries are generated and may contain mistakes; the official description above is the record.