# CVE-2021-33904: Cross-site scripting in n/a

> Cross-site scripting vulnerability in Accela Civic Platform allows attackers to inject scripts via the servProvCode parameter, requiring specific security flag configurations.

- **Severity:** Medium 6.1 (`CVSS:3.1/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:** 7 Jun 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-w8x8-8rp7-r92g

## What is CVE-2021-33904?

CVE-2021-33904 is a medium-severity cross-site scripting vulnerability in n/a, published on 7 Jun 2021. 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

In Accela Civic Platform through 21.1, the security/hostSignon.do parameter servProvCode is vulnerable to XSS. NOTE: The vendor states "there are configurable security flags and we are unable to reproduce them with the available information.

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

## Which versions are affected by CVE-2021-33904?

It affects 1 product.


Products: Accela Civic Platform.

## How do I fix CVE-2021-33904?

No fix has been published for CVE-2021-33904 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33904 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-33904 exists.

Public exploit code:

- Accela Civic Platform 21.1 - 'servProvCode' Cross-Site-Scripting (XSS) (exploitdb)
- Accela Civic Platform <=21.1 - Cross-Site Scripting (nuclei): http/cves/2021/CVE-2021-33904.yaml

## Other vulnerabilities in n/a

- [CVE-2021-34369](https://insights.sbomify.com/CVE-2021-34369/): Information disclosure in n/a (medium 6.5)
- [CVE-2021-34370](https://insights.sbomify.com/CVE-2021-34370/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2016-5660](https://insights.sbomify.com/CVE-2016-5660/): Cross-site scripting in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33904 and fix it if it is affected.

What it is: CVE-2021-33904 is a medium-severity cross-site scripting vulnerability in n/a, published on 7 Jun 2021. An attacker can exploit it over the internet without logging in, 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-2021-33904 exists.

Affected product: n/a. 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-2021-33904/ (Markdown: https://insights.sbomify.com/CVE-2021-33904/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33904
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33904
- OSV: https://osv.dev/vulnerability/CVE-2021-33904

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33904/
Summaries are generated and may contain mistakes; the official description above is the record.