CVE-2026-34403
Published:April 20, 2026
Updated:April 23, 2026
Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.5, all WebSocket endpoints in nginx-ui use a gorilla/websocket Upgrader with CheckOrigin unconditionally returning true, allowing Cross-Site WebSocket Hijacking (CSWSH). Combined with the fact that authentication tokens are stored in browser cookies (set via JavaScript without HttpOnly or explicit SameSite attributes), a malicious webpage can establish authenticated WebSocket connections to the nginx-ui instance when a logged-in administrator visits the attacker-controlled page. Version 2.3.5 patches the issue.
Affected Packages
github.com/0xJacky/Nginx-UI (GO):
Affected version(s) >=v0.0.0-20210720120120-b37c1e8eac41 <v1.9.10-0.20260316053337-1a9cd29a3082Fix Suggestion:
Update to version v1.9.10-0.20260316053337-1a9cd29a3082github.com/0xJacky/Nginx-UI (GO):
Affected version(s) >=v0.0.0-20210720120120-b37c1e8eac41 <v2.3.5Fix Suggestion:
Update to version v2.3.5Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.5
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
ACTIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
POC
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
EPSS
Base Score:
0.03
