#VU125028 Improper access control in nest - CVE-2026-2293
Published: April 7, 2026
Vulnerability identifier: #VU125028
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-2293
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
nest
nest
Software vendor:
nestjs
nestjs
Description
The vulnerability allows a remote attacker to bypass middleware-based security checks.
The vulnerability exists due to improper access control in the Nest Fastify adapter middleware matching logic when handling requests with variant paths under Fastify path-normalization options. A remote attacker can send a specially crafted request to bypass middleware-based security checks.
The issue occurs because middleware matching uses a regex check over req.originalUrl while route dispatch uses Fastify-normalized paths, allowing route-scoped middleware to be skipped while the protected handler is still reached.
Remediation
Install security update from vendor's website.