Auth bypass in 0xjacky Nginx-Ui

CVE-2026-84315

Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, Nginx UI does not apply RequireSecureSession to multiple authenticated mutation routes even though OTP-enabled users are expected to present a fresh X-Secure-Session-ID for sensitive actions. A stolen authenticated session can therefore create or alter automatic backups, DNS credentials and records, certificates and ACME users, Nginx control settings, and site or stream automation without completing the OTP or passkey step-up. This issue is fixed in version 2.4.1.

Vulnerability class: Broken Access Control

Published .

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-84315?
CVE-2026-84315 is a high-severity vulnerability in 0xjacky Nginx-Ui, classified under Missing Authorization. CVSS score: 8.3/10. Published 2026-10-12.
How severe is CVE-2026-84315?
High severity. CVSS v3 base score is 8.3 out of 10.