# CVE-2026-55946: Microsoft Copilot Information Disclosure Vulnerability

> An attacker can exploit AI command injection in Microsoft Copilot to disclose sensitive information over the network.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/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:** 17 Sep 2026
- **Updated:** 26 Oct 2026
- **Also known as:** GHSA-rq75-5hf2-vppm

## What is CVE-2026-55946?

CVE-2026-55946 is a medium-severity code injection vulnerability in Microsoft Copilot, published on 17 Sep 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

Ai command injection in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-55946?

It affects 1 product.


Products: Microsoft Copilot.

## How do I fix CVE-2026-55946?

No fix has been published for CVE-2026-55946 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-55946 being exploited?

There is no known exploitation of CVE-2026-55946 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Copilot

- [CVE-2026-24301](https://insights.sbomify.com/CVE-2026-24301/): Microsoft Copilot Information Disclosure Vulnerability (high 8.8)
- [CVE-2026-45497](https://insights.sbomify.com/CVE-2026-45497/): Microsoft M365 Copilot Remote Code Execution Vulnerability (high 7.7)
- [CVE-2026-42824](https://insights.sbomify.com/CVE-2026-42824/): M365 Copilot Information Disclosure Vulnerability (medium 6.5)
- [CVE-2026-26136](https://insights.sbomify.com/CVE-2026-26136/): Microsoft Copilot Information Disclosure Vulnerability (medium 6.5)
- [CVE-2026-55145](https://insights.sbomify.com/CVE-2026-55145/): Outlook Copilot Tampering Vulnerability (medium 6.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-55946 and fix it if it is affected.

What it is: CVE-2026-55946 is a medium-severity code injection vulnerability in Microsoft Copilot, published on 17 Sep 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-2026-55946 in the wild and no public exploit code.

Affected product: Microsoft Copilot. 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-2026-55946/ (Markdown: https://insights.sbomify.com/CVE-2026-55946/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-55946
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-55946
- OSV: https://osv.dev/vulnerability/CVE-2026-55946

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-55946/
Summaries are generated and may contain mistakes; the official description above is the record.