NextJS - Authorization Bypass (CVE-2025-29927)

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. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2025-29927 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2025-29927 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

Attack patterns are tailored towards application endpoints that rely on middleware-based authorization within NextJS deployments.