Vulnerability · Published Oct 9, 2026 · Assigned by GitHub_M

CVE-2026-107808Nginx UI: Authentication bypass: password login does not enforce a passkey-only second factor (2FA bypass)

High 8.1

In plain English

A high-severity improper authentication in nginx-ui from 0xJacky. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.4%top 64.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Nginx UI is a web user interface for the Nginx web server. From 2.0.0 until 2.5.0, POST /api/login checks EnabledOTP but does not require a WebAuthn assertion when EnabledPasskey is true and no TOTP secret is configured. A passkey-only account is therefore issued a session after password verification, despite Enabled2FA reporting that the account has a second factor. An attacker who obtains the password can take over the account and reach administrative functionality without the registered passkey. This issue is fixed in version 2.5.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/0xJacky/Nginx-UI	1.9.10-0.20260728074558-95cd21b70814	GHSA-45gv-9wjv-xh7p
Go	github.com/0xJacky/Nginx-UI	1.9.10-0.20260728074558-95cd21b70814	GO-2026-6704

Affected products (as reported)

Vendor	Product	Versions
0xJacky	nginx-ui	>= 2.0.0, < 2.5.0

Weakness: CWE-287, CWE-305, CWE-308 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-45gv-9wjv-xh7p x_refsource_CONFIRM
https://github.com/0xJacky/nginx-ui/commit/95cd21b70814e5d9a48a359aa238aeea1ac97429 x_refsource_MISC
https://github.com/0xJacky/nginx-ui/releases/tag/v2.5.0 x_refsource_MISC