# CVE-2018-8247: Cross-site scripting in Microsoft Office

> Attackers can exploit improper web request handling in Office Online Server to elevate privileges via cross-site scripting.

- **Severity:** Medium 5.4 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N`)
- **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 Jun 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-9635-5wrr-hhvf

## What is CVE-2018-8247?

CVE-2018-8247 is a medium-severity cross-site scripting vulnerability in Microsoft Office Online Server, published on 14 Jun 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

An elevation of privilege vulnerability exists when Office Web Apps Server 2013 and Office Online Server fail to properly handle web requests, aka "Microsoft Office Elevation of Privilege Vulnerability." This affects Microsoft Office, Microsoft Office Online Server. This CVE ID is unique from CVE-2018-8245.

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

## Which versions are affected by CVE-2018-8247?

It affects 2 products.


Products: Microsoft Office Online Server, Microsoft Office Web Apps.

## How do I fix CVE-2018-8247?

No fix has been published for CVE-2018-8247 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-8247 being exploited?

There is no known exploitation of CVE-2018-8247 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Office Online Server

- [CVE-2022-33648](https://insights.sbomify.com/CVE-2022-33648/): Microsoft Excel Remote Code Execution Vulnerability (high 7.8)
- [CVE-2017-8743](https://insights.sbomify.com/CVE-2017-8743/): Memory corruption in Microsoft Office (high 7.8)
- [CVE-2023-23396](https://insights.sbomify.com/CVE-2023-23396/): Microsoft Excel Denial of Service Vulnerability (medium 6.5)
- [CVE-2020-1442](https://insights.sbomify.com/CVE-2020-1442/): Cross-site scripting in Microsoft Office Online Server (medium 6.1)
- [CVE-2022-30159](https://insights.sbomify.com/CVE-2022-30159/): Microsoft Office Information Disclosure Vulnerability (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-8247 and fix it if it is affected.

What it is: CVE-2018-8247 is a medium-severity cross-site scripting vulnerability in Microsoft Office Online Server, published on 14 Jun 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-2018-8247 in the wild and no public exploit code.

Affected product: Microsoft Office Online 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-2018-8247/ (Markdown: https://insights.sbomify.com/CVE-2018-8247/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-8247
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-8247
- OSV: https://osv.dev/vulnerability/CVE-2018-8247

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-8247/
Summaries are generated and may contain mistakes; the official description above is the record.