# CVE-2018-12246: Cross-site scripting in Symantec Web Isolation

> Remote attackers can inject malicious JavaScript into end-user browsers via crafted URLs, bypassing web isolation protections.

- **Severity:** Medium 6.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/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:** 22 Oct 2018
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-f249-2px5-3wq5

## What is CVE-2018-12246?

CVE-2018-12246 is a medium-severity cross-site scripting vulnerability in Symantec Web Isolation, published on 22 Oct 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

Symantec Web Isolation (WI) 1.11 prior to 1.11.21 is susceptible to a reflected cross-site scripting (XSS) vulnerability. A remote attacker can target end users protected by WI with social engineering attacks using crafted URLs for legitimate web sites. A successful attack allows injecting malicious JavaScript code into the website's rendered copy running inside the end user's web browser. It does not allow injecting code into the real (isolated) copy of the website running on the WI Threat Isolation Engine.

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

## Which versions are affected by CVE-2018-12246?

It affects 1 product.


Products: Symantec Web Isolation.

## How do I fix CVE-2018-12246?

No fix has been published for CVE-2018-12246 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-12246 being exploited?

There is no known exploitation of CVE-2018-12246 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-12246 and fix it if it is affected.

What it is: CVE-2018-12246 is a medium-severity cross-site scripting vulnerability in Symantec Web Isolation, published on 22 Oct 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-2018-12246 in the wild and no public exploit code.

Affected product: Symantec Web Isolation. 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-2018-12246/ (Markdown: https://insights.sbomify.com/CVE-2018-12246/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-12246
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-12246
- OSV: https://osv.dev/vulnerability/CVE-2018-12246

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-12246/
Summaries are generated and may contain mistakes; the official description above is the record.