CVE-2026-84315 Nginx UI - Broken Access Control

Nginx UI < 2.4.1 contains a broken access control caused by missing RequireSecureSession enforcement on multiple authenticated mutation routes, letting attackers with stolen authenticated sessions bypass OTP/passkey step-up to modify sensitive settings.

CVSS base score 8.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.22% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Published
12 October 2026
Updated
15 October 2026
Weakness
CWE-862

Vendor fix

Update to version 2.4.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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