# CVE-2018-12270: Other in n/a

> Attackers can use homoglyphs to spoof URLs in the Steam client, tricking users into visiting malicious websites.

- **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:** 20 May 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-3gwr-m8f8-mc52

## What is CVE-2018-12270?

CVE-2018-12270 is a medium-severity vulnerability in n/a, published on 20 May 2019. 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

In Valve Steam 1528829181 BETA, it is possible to perform a homograph / homoglyph attack to create fake URLs in the client, which may trick users into visiting unintended web sites.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2018-12270?

It affects 1 product.


Products: Valvesoftware Steam Client.

## How do I fix CVE-2018-12270?

No fix has been published for CVE-2018-12270 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-12270 being exploited?

There is no known exploitation of CVE-2018-12270 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-30481](https://insights.sbomify.com/CVE-2021-30481/): Memory corruption in n/a (high 8.0)
- [CVE-2020-15530](https://insights.sbomify.com/CVE-2020-15530/): Race condition in n/a (high 7.8)
- [CVE-2019-17180](https://insights.sbomify.com/CVE-2019-17180/): Path traversal in n/a (high 7.8)
- [CVE-2019-15315](https://insights.sbomify.com/CVE-2019-15315/): Privilege escalation in n/a (high 7.8)
- [CVE-2015-7985](https://insights.sbomify.com/CVE-2015-7985/): Privilege escalation in n/a (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-12270 and fix it if it is affected.

What it is: CVE-2018-12270 is a medium-severity vulnerability in n/a, published on 20 May 2019. 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-2018-12270 in the wild and no public exploit code.

Affected product: n/a. 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-2018-12270/ (Markdown: https://insights.sbomify.com/CVE-2018-12270/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-12270
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-12270
- OSV: https://osv.dev/vulnerability/CVE-2018-12270

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-12270/
Summaries are generated and may contain mistakes; the official description above is the record.