CVE-2026-42220 Nginx-UI: Authenticated settings disclosure exposes node.secret and enables trusted-node authentication abuse, backup exfiltration, and restore-based nginx-ui state rollback
Authenticated users can retrieve sensitive node secrets, enabling trusted-node authentication abuse and state rollback in Nginx UI.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42220?
CVE-2026-42220 is a medium-severity vulnerability in 0xJacky nginx-ui, published on 4 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, an authenticated user can call GET /api/settings and retrieve sensitive configuration values, including node.secret. The same node.secret is accepted by AuthRequired() through the X-Node-Secret header (or node_secret query parameter), causing the request to be treated as authenticated via the trusted-node path and associated with the init user. This issue has been patched in version 2.3.8.
Which versions are affected by CVE-2026-42220?
3 open source packages ship an affected version, including github.com/0xJacky/Nginx-UI. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/0xJacky/Nginx-UI Go | All versions | None |
github.com/0xJacky/Nginx-UI Go | All versions to 1.9.9 | None |
github.com/0xJacky/Nginx-UI Go | All versions to 1.9.9 | None |
Products include Nginxui Nginx Ui.
How do I fix CVE-2026-42220?
Upgrade to a fixed version.
Is CVE-2026-42220 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42220 exists.
Other vulnerabilities in 0xJacky nginx-ui
- CVE-2026-33032 Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
- CVE-2026-27944 Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
- CVE-2024-23827 Nginx-UI arbitrary file write through the Import Certificate feature
- CVE-2026-107806 Nginx UI: Authenticated Remote Code Execution via Backup Restore App Config Overwrite
- CVE-2026-33026 nginx-ui Backup Restore Allows Tampering with Encrypted Backups
Sources
Also known as GHSA-7jrr-xw9c-mj39, GO-2026-5227.