NextJS - Authorization Bypass (CVE-2025-29927)
59Exploiting IPs reported
In NextJS React framework prior to 14.2.25 and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware
CrowdSec analysis
CVE-2025-29927 is a high-severity vulnerability affecting the NextJS React framework, which allows attackers to bypass authorization checks when these controls are enforced through application middleware.
CrowdSec has been tracking this vulnerability and its exploits since 24th of March 2025.
Data from the CrowdSec community indicates that exploitation of CVE-2025-29927 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. CrowdSec network telemetry also shows that exploitation of CVE-2025-29927 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.
Attack patterns are tailored towards application endpoints that rely on middleware-based authorization within NextJS deployments.
Exploitation
Get real-time information about exploitation attempts and actors involved.
Protection
Find out relevant information to protect your stack against this CVE.
Blocklist
With our advanced worldwide network detection, CrowdSec can provide a list of IPs known for exploiting the vulnerability.
To increase your protection against this CVE, block exploitation attempts with this list of identified actors.