# CVE-2018-15703: Cross-site scripting in Advantech WebAccess

> Remote attackers can execute arbitrary scripts in victims' browsers via reflected XSS in Advantech WebAccess, potentially leading to session hijacking or malicious actions.

- **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-9qvr-7cx5-jpxc

## What is CVE-2018-15703?

CVE-2018-15703 is a medium-severity cross-site scripting vulnerability in Advantech Webaccess, 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

Advantech WebAccess 8.3.2 and below is vulnerable to multiple reflected cross site scripting vulnerabilities. A remote unauthenticated attacker could potentially exploit this vulnerability by tricking a victim to supply malicious HTML or JavaScript code to WebAccess, which is then reflected back to the victim and executed by the web browser.

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

## Which versions are affected by CVE-2018-15703?

It affects 1 product.


Products: Advantech Webaccess.

## How do I fix CVE-2018-15703?

No fix has been published for CVE-2018-15703 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-15703 being exploited?

There is no known exploitation of CVE-2018-15703 in the wild and no public exploit code.

## Other vulnerabilities in Advantech Webaccess

- [CVE-2014-9208](https://insights.sbomify.com/CVE-2014-9208/): Multiple stack-based buffer overflows in unspecified DLL files in Advantech WebAccess before 8.0.1 allow remote attackers to execute arbitra (critical 10.0)
- [CVE-2021-33023](https://insights.sbomify.com/CVE-2021-33023/): Advantech WebAccess (critical 9.8)
- [CVE-2021-38389](https://insights.sbomify.com/CVE-2021-38389/): Advantech WebAccess (critical 9.8)
- [CVE-2021-38408](https://insights.sbomify.com/CVE-2021-38408/): Memory corruption in Advantech WebAccess (critical 9.8)
- [CVE-2020-12019](https://insights.sbomify.com/CVE-2020-12019/): Memory corruption in WebAccess Node (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-15703 and fix it if it is affected.

What it is: CVE-2018-15703 is a medium-severity cross-site scripting vulnerability in Advantech Webaccess, 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-2018-15703 in the wild and no public exploit code.

Affected product: Advantech Webaccess. 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-2018-15703/ (Markdown: https://insights.sbomify.com/CVE-2018-15703/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-15703
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-15703
- OSV: https://osv.dev/vulnerability/CVE-2018-15703

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-15703/
Summaries are generated and may contain mistakes; the official description above is the record.