the CRITICAL 9.1 severity Next.js vulnerability
Source: YouTube · John Hammond · published Mar 24, 2025 · 19:20
CVE-2025-29927 is a critical Next.js vulnerability allowing authorization bypass via a simple HTTP header, with a CVSS score of 9.1 0:00-0:30.
Key Takeaways:
• The vulnerability affects Next.js versions before 14.2.25 and 15.2.3, enabling middleware bypass using the "x-middleware-subrequest" header 0:13-0:26
• Researchers zhero and Enzo discovered the vulnerability and published a detailed technical analysis of how the middleware bypass works 1:55-2:15
• A simple curl command with a modified header can completely bypass authentication and access protected pages 10:16-10:25
• Beyond authentication bypass, the vulnerability could enable cache poisoning attacks leading to denial of service 14:23-14:28
• Vercel addressed the vulnerability within hours of being notified, though the flaw had existed in the codebase for years 17:43-17:49
This critical vulnerability highlights how a seemingly minor implementation detail can have severe security implications in widely-used frameworks.
Sources:
- 0:00-0:30 Introduction to CVE-2025-29927 and its critical severity
- 0:13-0:26 Affected Next.js versions and vulnerability description
- 1:55-2:15 Researchers who discovered the vulnerability
- 10:16-10:25 Demonstration of simple header-based exploit
- 14:23-14:28 Additional attack vectors like cache poisoning
- 17:43-17:49 Vercel's response timel
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First 800 characters of the transcript
CVE 202529927 Next.js is a React framework for building full stack web apps. Prior to versions 14.2.25 and 15.2.3, it's possible to bypass authorization checks within a Nex.js application. If the authorization check occurs in the middleware, this vulnerability is fixed in versions 14.2.25 and 15.2.3, 2.3, but the base CVSS score was a whopping 9.1 critical. Now, let me say this has a lot of drama with it. Being in the front-end world and being React and Versel and Nex.js and whatever, I don't know. Look, I'm not a front-end developer. I say that outright. I don't have a whole lot of ground to stand on, but CVE's vulnerability cyber security stuff. Ah, I got a little bit of ground to stand on. This is the CVE ID reservation from NIST. And if you wanted to take a look down below, they do hav…