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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-05-14 · updated 2026-06-17
Weakness: CWE-918

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`.

Affected products

Next.js: from 13.4.0 before 14.1.1 — fixed in 14.1.1
Npm Next: from 13.4.0 before 14.1.1 — fixed in 14.1.1

How to fix

Upgrade to a fixed version: Next.js 14.1.1; Npm Next 14.1.1. Check the vendor advisory for mitigations.

References

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