# CVE-2021-42535: VISAM VBASE Editor Cross Site Scripting

> An attacker can inject malicious scripts into the VISAM VBASE Editor web interface, potentially compromising user sessions or executing code.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/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:** 27 Jul 2022
- **Updated:** 17 Apr 2025
- **Also known as:** GHSA-8vjc-vph9-rg4j

## What is CVE-2021-42535?

CVE-2021-42535 is a medium-severity cross-site scripting vulnerability in VISAM VBASE Pro-RT/ Server-RT (Web Remote), published on 27 Jul 2022. 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

VISAM VBASE version 11.6.0.6 does not neutralize or incorrectly neutralizes user-controllable input before the data is placed in output used as a public-facing webpage.

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

## Which versions are affected by CVE-2021-42535?

It affects 1 product.


Products: Visam Vbase Web-Remote.

## How do I fix CVE-2021-42535?

No fix has been published for CVE-2021-42535 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-42535 being exploited?

There is no known exploitation of CVE-2021-42535 in the wild and no public exploit code.

## Other vulnerabilities in VISAM VBASE Pro-RT/ Server-RT (Web Remote)

- [CVE-2021-38417](https://insights.sbomify.com/CVE-2021-38417/): VISAM VBASE Editor Improper Access Control (high 7.4)
- [CVE-2021-42537](https://insights.sbomify.com/CVE-2021-42537/): VISAM VBASE Editor Improper Restriction of XML (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42535 and fix it if it is affected.

What it is: CVE-2021-42535 is a medium-severity cross-site scripting vulnerability in VISAM VBASE Pro-RT/ Server-RT (Web Remote), published on 27 Jul 2022. 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-2021-42535 in the wild and no public exploit code.

Affected product: VISAM VBASE Pro-RT/ Server-RT (Web Remote). 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-2021-42535/ (Markdown: https://insights.sbomify.com/CVE-2021-42535/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42535
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42535
- OSV: https://osv.dev/vulnerability/CVE-2021-42535

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42535/
Summaries are generated and may contain mistakes; the official description above is the record.