CVE-2026-34403

HIGH

8.1

Description

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.

CVE Details

CVSS v3.1 Score8.1

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published4/20/2026

Last Modified4/22/2026

Sourcenvd

Honeypot Sightings0

Affected Products

nginxui:nginx_ui

Weaknesses (CWE)

CWE-1385

References

https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.5(security-advisories@github.com)

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-78mf-482w-62qj(security-advisories@github.com)

IOC Correlations

No correlations recorded

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