CVE-2026-27944 Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
Unauthenticated attackers can download and decrypt Nginx UI backups, exposing sensitive credentials and keys.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-27944?
CVE-2026-27944 is a critical missing authorization vulnerability in 0xJacky nginx-ui, published on 5 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.3, the /api/backup endpoint is accessible without authentication and discloses the encryption keys required to decrypt the backup in the X-Backup-Security response header. This allows an unauthenticated attacker to download a full system backup containing sensitive data (user credentials, session tokens, SSL private keys, Nginx configurations) and decrypt it immediately. This issue has been patched in version 2.3.3.
Which versions are affected by CVE-2026-27944?
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 | 2.3.3 |
github.com/0xJacky/Nginx-UI Go | All versions | 2.3.3 |
Products include Nginxui Nginx Ui.
How do I fix CVE-2026-27944?
Upgrade github.com/0xJacky/Nginx-UI to 2.3.3 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-27944 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27944 exists.
Public exploit code: 1 Nuclei template and 7 proofs of concept on GitHub.
Other vulnerabilities in 0xJacky nginx-ui
- CVE-2026-33032 Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
- 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
- CVE-2026-42238 Unauthenticated Remote Code Execution via Backup Restore in nginx-ui
Sources
Also known as GHSA-g9w5-qffc-6762, GO-2026-4614.