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Fencer Intel
high 8.1

CVE-2026-107808 json

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

published last mo. modified 20d ago also EUVD-2026-95891 , GHSA-45gv-9wjv-xh7p , GO-2026-6704

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/0xJacky/Nginx-UI 1.9.10-0.20260728074558-95cd21b70814
  • nginxui nginx_ui 2.5.0

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
last mo.

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-45gv-9wjv-xh7p referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/0xJacky/Nginx-UI
>=1.9.10-0.20250517140552-daee3ac7ade1, <1.9.10-0.20260728074558-95cd21b70814
1.9.10-0.20260728074558-95cd21b70814

Affected products

  • 0xJacky nginx-ui

Classification

Weakness
  • CWE-287 Improper Authentication
  • CWE-305 Authentication Bypass by Primary Weakness
  • CWE-308 Use of Single-factor Authentication

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.