THREATPORT/VULNERABILITY/CVE-2026-27944
CRITICAL SEVERITY

CVE-2026-27944

Nginx Ui vulnerability

CVSS
9.8
EPSS
22.2%
EPSS pct
97th
Exploited
No known
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.
Affected vendor
Nginxui
Affected product
Nginx Ui
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-306 — Missing Authentication for Critical Function
  • CWE-311 — Missing Encryption of Sensitive Data
Published
2026-03-05

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 22.2% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2026-27944

  • Confirm whether Nginxui Nginx Ui is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2026-27944.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-27944

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2026-27944 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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