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CVE-2026-27978— Next.js: null origin can bypass Server Actions CSRF checks

Quick assessment

Affected
vercel next.js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Next.js是Vercel开源的一个 React 框架。 Next.js 16.0.1至16.1.7之前版本存在安全漏洞，该漏洞源于服务器操作CSRF验证期间将origin: null视为缺失来源，可能导致绕过来源验证，引发跨站请求伪造攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.23% · P12
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I. Basic Information for CVE-2026-27978

Vulnerability Information
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Vulnerability Title
Next.js: null origin can bypass Server Actions CSRF checks
Source: CVE Program / CVE List V5
Vulnerability Description
Next.js is a React framework for building full-stack web applications. Starting in version 16.0.1 and prior to version 16.1.7, `origin: null` was treated as a "missing" origin during Server Action CSRF validation. As a result, requests from opaque contexts (such as sandboxed iframes) could bypass origin verification instead of being validated as cross-origin requests. An attacker could induce a victim browser to submit Server Actions from a sandboxed context, potentially executing state-changing actions with victim credentials (CSRF). This is fixed in version 16.1.7 by treating `'null'` as an explicit origin value and enforcing host/origin checks unless `'null'` is explicitly allowlisted in `experimental.serverActions.allowedOrigins`. If upgrading is not immediately possible, add CSRF tokens for sensitive Server Actions, prefer `SameSite=Strict` on sensitive auth cookies, and/or do not allow `'null'` in `serverActions.allowedOrigins` unless intentionally required and additionally protected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Next.js 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Next.js是Vercel开源的一个 React 框架。 Next.js 16.0.1至16.1.7之前版本存在安全漏洞，该漏洞源于服务器操作CSRF验证期间将origin: null视为缺失来源，可能导致绕过来源验证，引发跨站请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vercel next.js >= 16.0.1, < 16.1.7 -

II. Public POCs for CVE-2026-27978

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III. Intelligence Information for CVE-2026-27978

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Patches & Fixes for CVE-2026-27978 (1)

Vendor Advisories for CVE-2026-27978 (1)

Vendor Pages for CVE-2026-27978 (1)

IV. Related Vulnerabilities

Same product: next.js
Same vendor: vercel
Same weakness: CWE-352

V. Comments for CVE-2026-27978

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