What is CVE-2026-34403?

CVE-2026-34403 is a high-severity vulnerability in 0xjacky Nginx-ui, classified under CWE-1385. CVSS score: 8.1/10. Published 2026-04-20.

How severe is CVE-2026-34403?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in 0xjacky Nginx-ui

CVE-2026-34403

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 Hijackin…

EPSS: 0.002 (7.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

0xjacky Nginx-ui — versions < 2.3.5
Nginxui Nginx_ui

Weakness classification (CWE)

CWE-1385

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
security-advisories@github.com (Product, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-34403?: CVE-2026-34403 is a high-severity vulnerability in 0xjacky Nginx-ui, classified under CWE-1385. CVSS score: 8.1/10. Published 2026-04-20.
How severe is CVE-2026-34403?: High severity. CVSS v3 base score is 8.1 out of 10.