CVE-2020-15242 Open Redirect in Next.js
Attackers can redirect users from a trusted Next.js site to malicious external domains, facilitating phishing attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-15242?
CVE-2020-15242 is a medium-severity vulnerability in Vercel Next.js, published on 8 Oct 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Next.js versions >=9.5.0 and <9.5.4 are vulnerable to an Open Redirect. Specially encoded paths could be used with the trailing slash redirect to allow an open redirect to occur to an external site. In general, this redirect does not directly harm users although can allow for phishing attacks by redirecting to an attackers domain from a trusted domain. The issue is fixed in version 9.5.4.
Weakness: CWE-601
Which versions are affected by CVE-2020-15242?
2 open source packages ship an affected version, including next. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
next npm | From 9.5.0 | 9.5.4 |
next npm | From 9.5.0 | 9.5.4 |
Products include Vercel Next.js.
How do I fix CVE-2020-15242?
Upgrade next to 9.5.4 or later.
Is CVE-2020-15242 being exploited?
There is no known exploitation of CVE-2020-15242 in the wild and no public exploit code.
Other vulnerabilities in Vercel Next.js
- CVE-2025-29927 Authorization Bypass in Next.js Middleware
- CVE-2026-44578 Next.js: Server-side request forgery in applications using WebSocket upgrades
- CVE-2026-94483 Next.js: Server-Side Request Forgery in Image Optimization
- CVE-2026-64642 Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale
- CVE-2026-64645 Next.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostname
Sources
Also known as GHSA-x56p-c8cg-q435.