# CVE-2021-4270: Imprint CMS ViewHelpers.cs SearchForm cross site scripting

> Remote attackers can inject malicious scripts via the search form in Imprint CMS, potentially leading to session hijacking or code execution.

- **Severity:** Low 3.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 21 Dec 2022
- **Updated:** 14 Apr 2025
- **Also known as:** GHSA-w6q6-wx5h-j9h7

## What is CVE-2021-4270?

CVE-2021-4270 is a low-severity cross-site scripting vulnerability in unspecified Imprint CMS, published on 21 Dec 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A vulnerability was found in Imprint CMS. It has been classified as problematic. Affected is the function SearchForm of the file ImprintCMS/Models/ViewHelpers.cs. The manipulation of the argument query leads to cross site scripting. It is possible to launch the attack remotely. The name of the patch is 6140b140ccd02b5e4e7d6ba013ac1225724487f4. It is recommended to apply a patch to fix this issue. VDB-216474 is the identifier assigned to this vulnerability.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-707 (Improper Neutralization)

## Which versions are affected by CVE-2021-4270?

It affects 1 product.


Products: Imprint Cms Project Imprint Cms.

## How do I fix CVE-2021-4270?

No fix has been published for CVE-2021-4270 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-4270 being exploited?

There is no known exploitation of CVE-2021-4270 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-4270 and fix it if it is affected.

What it is: CVE-2021-4270 is a low-severity cross-site scripting vulnerability in unspecified Imprint CMS, published on 21 Dec 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-4270 in the wild and no public exploit code.

Affected product: unspecified Imprint CMS. 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-2021-4270/ (Markdown: https://insights.sbomify.com/CVE-2021-4270/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-4270
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-4270
- OSV: https://osv.dev/vulnerability/CVE-2021-4270

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-4270/
Summaries are generated and may contain mistakes; the official description above is the record.