# CVE-2018-8582: Code injection in Microsoft Office

> Attackers can execute arbitrary code by tricking users into opening specially modified rule export files in Microsoft Outlook.

- **Severity:** High 8.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** 14 Nov 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-3p5h-mwh8-3wx4

## What is CVE-2018-8582?

CVE-2018-8582 is a high-severity code injection vulnerability in Microsoft Office 365 Proplus, published on 14 Nov 2018. 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

A remote code execution vulnerability exists in the way that Microsoft Outlook parses specially modified rule export files, aka "Microsoft Outlook Remote Code Execution Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Outlook. This CVE ID is unique from CVE-2018-8522, CVE-2018-8524, CVE-2018-8576.

## Which versions are affected by CVE-2018-8582?

It affects 4 products.


Products: Microsoft Office 365 Proplus, Microsoft Outlook, Microsoft Outlook Rt, Microsoft Windows Server 2019.

## How do I fix CVE-2018-8582?

No fix has been published for CVE-2018-8582 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-8582 being exploited?

There is no known exploitation of CVE-2018-8582 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Office 365 Proplus

- [CVE-2020-0979](https://insights.sbomify.com/CVE-2020-0979/): Memory corruption in Office 365 ProPlus (high 8.8)
- [CVE-2020-0697](https://insights.sbomify.com/CVE-2020-0697/): Privilege escalation in Office 365 ProPlus (high 7.8)
- [CVE-2020-0653](https://insights.sbomify.com/CVE-2020-0653/): Memory corruption in Office 365 ProPlus (high 7.8)
- [CVE-2018-8575](https://insights.sbomify.com/CVE-2018-8575/): Memory corruption in Microsoft Project (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-8582 and fix it if it is affected.

What it is: CVE-2018-8582 is a high-severity code injection vulnerability in Microsoft Office 365 Proplus, published on 14 Nov 2018. 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-2018-8582 in the wild and no public exploit code.

Affected product: Microsoft Office 365 Proplus. 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-2018-8582/ (Markdown: https://insights.sbomify.com/CVE-2018-8582/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-8582
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-8582
- OSV: https://osv.dev/vulnerability/CVE-2018-8582

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-8582/
Summaries are generated and may contain mistakes; the official description above is the record.