High severity · published Oct 9, 2026
CVE-2026-107808
Nginx UI: Authentication bypass: password login does not enforce a passkey-only second factor (2FA bypass)
8.1
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NG
nginx-ui · 0xJacky
>= 2.0.0, < 2.5.0 · source: vendor
NU
Nginx UI · Nginxui
2.0.0 before 2.5.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107808
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107808
x_refsource_CONFIRM
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-45gv-9wjv-xh7p
x_refsource_MISC
https://github.com/0xJacky/nginx-ui/commit/95cd21b70814e5d9a48a359aa238aeea1ac97429
x_refsource_MISC
https://github.com/0xJacky/nginx-ui/releases/tag/v2.5.0
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