# CVE-2021-32818: Remote code execution and Reflected cross site scripting in haml-coffee


- **Severity:** High 7.7 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 14 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-m7mf-vm62-7x3q

## What is CVE-2021-32818?

CVE-2021-32818 is a high-severity vulnerability in netzpirat haml-coffee, published on 14 May 2021. 

### Official description

haml-coffee is a JavaScript templating solution. haml-coffee mixes pure template data with engine configuration options through the Express render API. More specifically, haml-coffee supports overriding a series of HTML helper functions through its configuration options. A vulnerable application that passes user controlled request objects to the haml-coffee template engine may introduce RCE vulnerabilities. Additionally control over the escapeHtml parameter through template configuration pollution ensures that haml-coffee would not sanitize template inputs that may result in reflected Cross Site Scripting attacks against downstream applications. There is currently no fix for these issues as of the publication of this CVE. The latest version of haml-coffee is currently 1.14.1. For complete details refer to the referenced GHSL-2021-025.

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

## Which versions are affected by CVE-2021-32818?

2 open source packages ship an affected version, including haml-coffee. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `haml-coffee` | npm | All versions to 1.14.1 | None |
| `haml-coffee` | npm | All versions to 1.14.1 | None |

Products: Haml-Coffee Project Haml-Coffee.

## How do I fix CVE-2021-32818?

No fix has been published for CVE-2021-32818 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-32818 being exploited?

There is no known exploitation of CVE-2021-32818 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32818 and fix it if it is affected.

What it is: CVE-2021-32818 is a high-severity vulnerability in netzpirat haml-coffee, published on 14 May 2021. 
Exploitation: There is no known exploitation of CVE-2021-32818 in the wild and no public exploit code.

Affected packages and fixed versions:
- haml-coffee (npm): affected all versions up to 1.14.1; no fix listed
- haml-coffee (npm): affected all versions up to 1.14.1; no fix listed

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-2021-32818/ (Markdown: https://insights.sbomify.com/CVE-2021-32818/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32818
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32818
- OSV: https://osv.dev/vulnerability/CVE-2021-32818

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32818/
Summaries are generated and may contain mistakes; the official description above is the record.