# CVE-2025-3841: wix-incubator jam Jinja2 Template jam.py special elements used in a template engine

> Attackers can execute arbitrary code via malicious template arguments in the wix-incubator jam Jinja2 handler.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Apr 2025
- **Updated:** 24 Apr 2025
- **Also known as:** GHSA-q438-4f7x-vcx4

## What is CVE-2025-3841?

CVE-2025-3841 is a medium-severity code injection vulnerability in wix-incubator jam, published on 21 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability, which was classified as problematic, was found in wix-incubator jam up to e87a6fd85cf8fb5ff37b62b2d68f917219d07ae9. This affects an unknown part of the file jam.py of the component Jinja2 Template Handler. The manipulation of the argument config['template'] leads to improper neutralization of special elements used in a template engine. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used. This product takes the approach of rolling releases to provide continious delivery. Therefore, version details for affected and updated releases are not available.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-791 (Incomplete Filtering of Special Elements), CWE-1336 (Improper Neutralization of Special Elements Used in a Template Engine)

## Which versions are affected by CVE-2025-3841?

It affects 1 product.


Products: Wix Jam.

## How do I fix CVE-2025-3841?

No fix has been published for CVE-2025-3841 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-3841 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3841 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-3841 and fix it if it is affected.

What it is: CVE-2025-3841 is a medium-severity code injection vulnerability in wix-incubator jam, published on 21 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3841 exists.

Affected product: wix-incubator jam. 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-2025-3841/ (Markdown: https://insights.sbomify.com/CVE-2025-3841/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-3841
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-3841
- OSV: https://osv.dev/vulnerability/CVE-2025-3841

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-3841/
Summaries are generated and may contain mistakes; the official description above is the record.