Critical Nginx UI vulnerability allows unauthenticated backup theft. 🐚
CVE-2026-27944 · Severity 9.8 · Unauthenticated Backup Download in Nginx UI.
A critical vulnerability in Nginx UI has been confirmed as under active exploitation. The flaw allows unauthenticated attackers to download and decrypt full system backups, exposing SSL private keys, administrative credentials, and session tokens.
Automated scanners are currently targeting Nginx UI management portals to harvest these backups. Because this allows for full server impersonation and administrative takeover, it represents a maximum-severity risk for any organization running an exposed Nginx UI instance.
The uncomfortable truth: Your backup strategy is an asset for an attacker if your management tool leaves the encryption keys exposed to the public internet.
→ Update Nginx UI to the latest security version and ensure the backup API endpoint is restricted.
→ Restrict access to all management interfaces through private networks or secure zero-trust tunnels.
→ Rotate any SSL private keys and administrative credentials if your portal was internet-exposed.
Have you verified that your web server management tools are hidden from public automated scanners? 👇
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