# CVE-2021-47808: Cotonti Siena 0.9.19 - 'maintitle' Stored Cross-Site Scripting

> Attackers can inject malicious JavaScript via the site title parameter, leading to script execution when administrators view the configuration page.

- **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:** 15 Jan 2026
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-gqqp-x5qv-896x

## What is CVE-2021-47808?

CVE-2021-47808 is a medium-severity cross-site scripting vulnerability in cotonti.com Cotonti Siena, published on 15 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

Cotonti Siena 0.9.19 contains a stored cross-site scripting vulnerability in the admin configuration panel's site title parameter. Attackers can inject malicious JavaScript code through the 'maintitle' parameter to execute scripts when administrators view the page.

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

## Which versions are affected by CVE-2021-47808?

It affects 1 product.


Products: Cotonti Cotonti Siena.

## How do I fix CVE-2021-47808?

No fix has been published for CVE-2021-47808 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-47808 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47808 exists.

## Other vulnerabilities in cotonti.com Cotonti Siena

- [CVE-2013-4789](https://insights.sbomify.com/CVE-2013-4789/): SQL injection in n/a (high 7.5)
- [CVE-2025-44115](https://insights.sbomify.com/CVE-2025-44115/): Cross-site scripting in n/a (medium 5.4)
- [CVE-2024-24115](https://insights.sbomify.com/CVE-2024-24115/): Cross-site scripting in n/a (medium 5.4)
- [CVE-2022-39839](https://insights.sbomify.com/CVE-2022-39839/): Cross-site scripting in n/a (medium 4.8)
- [CVE-2022-39840](https://insights.sbomify.com/CVE-2022-39840/): Cross-site scripting in n/a (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47808 and fix it if it is affected.

What it is: CVE-2021-47808 is a medium-severity cross-site scripting vulnerability in cotonti.com Cotonti Siena, published on 15 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47808 exists.

Affected product: cotonti.com Cotonti Siena. 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-2021-47808/ (Markdown: https://insights.sbomify.com/CVE-2021-47808/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47808
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47808
- OSV: https://osv.dev/vulnerability/CVE-2021-47808

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47808/
Summaries are generated and may contain mistakes; the official description above is the record.