CVE-2026-27978
Next.js is a React framework for building full-stack web applications.
Published Mar 18, 2026 · updated Jun 17, 2026 · vercel next.js
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, 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 as an explicit origin value and enforcing host/origin checks unless is explicitly allowlisted in . If upgrading is not immediately possible, add CSRF tokens for sensitive Server Actions, prefer on sensitive auth cookies, and/or do not allow in unless intentionally required and additionally protected.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Mar 18, 2026 · NIST NVD
Detected
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, 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
Jun 17, 2026 · NIST NVD
Updated
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, 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
Affected
- cpe vercel/next.jsversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-27978
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-27978
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, was treated as a "missing" origin during Server Action CSRF validation. As a result, requests from opaque contexts (such as sandboxed ifra
nvd.nist.gov