# CVE-2021-47834: Schlix CMS 2.2.6-6 - 'title' Persistent Cross-Site Scripting (Authenticated)

> Authenticated attackers can inject persistent scripts into category titles, leading to code execution or account takeover when viewed by others.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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:** 16 Jan 2026
- **Updated:** 5 Mar 2026
- **Also known as:** GHSA-524r-9v5q-wjww

## What is CVE-2021-47834?

CVE-2021-47834 is a medium-severity cross-site scripting vulnerability in Schlix CMS, published on 16 Jan 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Schlix CMS 2.2.6-6 contains a persistent cross-site scripting vulnerability that allows authenticated users to inject malicious scripts into category titles. Attackers can create a new contact category with a script payload that will execute when the page is viewed by other users.

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

## Which versions are affected by CVE-2021-47834?


## How do I fix CVE-2021-47834?

No fix has been published for CVE-2021-47834 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-47834 being exploited?

There is no known exploitation of CVE-2021-47834 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47834 and fix it if it is affected.

What it is: CVE-2021-47834 is a medium-severity cross-site scripting vulnerability in Schlix CMS, published on 16 Jan 2026. 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-2021-47834 in the wild and no public exploit code.

Affected product: Schlix 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-2021-47834/ (Markdown: https://insights.sbomify.com/CVE-2021-47834/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47834
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47834
- OSV: https://osv.dev/vulnerability/CVE-2021-47834

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47834/
Summaries are generated and may contain mistakes; the official description above is the record.