What is CVE-2026-84360?

CVE-2026-84360 is a high-severity vulnerability in 0xjacky Nginx-Ui, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 8.1/10. Published 2026-10-12.

How severe is CVE-2026-84360?

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

Vulnerability in 0xjacky Nginx-Ui

CVE-2026-84360

Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, the HTTP configuration mutation routes require RequireSecureSession, but /mcp and /mcp_message require only ordinary authentication before exposing nginx_config_add and nginx_config_modify. An OTP-enabled user with a normal JWT but no valid X-Secure-Session-ID can therefore create or modify Nginx configuration and trigger reload behavior through MCP, bypassing the intended step-up control. This issue is fixed in version 2.4.1.

Published 2026-10-12.

CVSS v3 metric

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

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

0xjacky Nginx-Ui — versions < 2.4.1

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

References

Frequently asked questions

What is CVE-2026-84360?: CVE-2026-84360 is a high-severity vulnerability in 0xjacky Nginx-Ui, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 8.1/10. Published 2026-10-12.
How severe is CVE-2026-84360?: High severity. CVSS v3 base score is 8.1 out of 10.