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CVE-2026-27944

Nginxui Nginx UI authentication bypass

9.8 CRITICALPublic exploitEPSS 1.01%
  1. Published5 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Nginxui Nginx UI< 2.3.3

Remediation

Fixed in
Nginxui Nginx UI≥ 2.3.3

References

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Frequently asked

Is CVE-2026-27944 being actively exploited?

CVE-2026-27944 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.01%.

How severe is CVE-2026-27944?

CVE-2026-27944 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.01% probability of exploitation.

Which products are affected by CVE-2026-27944?

Affected products include Nginxui Nginx UI.

How do I fix CVE-2026-27944?

Upgrade affected software to a fixed version, for example Nginxui Nginx UI 2.3.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27944 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.