What is the CVSS score of CVE-2026-27944?

CVE-2026-27944 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 1.0%.

Is there a public PoC exploit available for CVE-2026-27944?

Yes, a public proof-of-concept exploit is available for CVE-2026-27944. Prioritise patching immediately. EPSS: 1.0%.

How to fix or mitigate CVE-2026-27944?

Within 24 hours: Identify all systems running Nginx UI versions up to 2.3.3 and isolate them from untrusted networks; disable Nginx UI administrative interfaces if not actively required. Within 7 days: Implement network-level access controls restricting UI access to authorized administrators only; deploy WAF rules blocking exploitation patterns if available from the vendor. Within 30 days: Upgrade to a patched version when released by the vendor, or replace Nginx UI with an alternative solution if no patch timeline is provided.

Nginx Ui CVE-2026-27944

CRITICAL

Missing Authentication for Critical Function (CWE-306)

2026-03-05 security-advisories@github.com

GHSA-g9w5-qffc-6762

TLS Nginx Nginx Ui Suse Nginxui

9.8

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send unauthenticated HTTP GET request to /api/backup
Exploit

Receive encrypted backup file and decryption key in X-Backup-Security header
Execution

Decrypt backup locally
Impact

Extract sensitive credentials and SSL keys

Vulnerability Assessment

Weakness	CWE CWE-306 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Authentication required for critical functions MITRE ATT&CK 1 technique across 1 tactic: Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Nginx UI version prior to 2.3.3 with /api/backup endpoint enabled. No authentication required; exploitable against default deployment configurations accessible over network.
Impact	CVSS 9.8, EPSS 1.0%.
Exploit ScenarioDerived	Download backups containing credentials, or exploit for RCE.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 1.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Unauthenticated backup download and RCE in Nginx UI before 2.3.3. EPSS 1.0%. PoC available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:06 CVSS 9.8

Unauthenticated RCE in Nginx UI.

RemediationAI

Update to 2.3.3.

Affected Packages

go github.com/0xjacky/nginx-ui fix: 2.3.3

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in go

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-306 on /api/backup endpoint.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SUSE CRITICAL

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

PoC Detected

Mar 10, 2026 - 18:11 vuln.today

Public exploit code

CVE Published

Mar 05, 2026 - 19:16 nvd

CRITICAL 9.8

DescriptionGitHub Advisory

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.

Articles & Coverage 1

POC CVE-2026-27944: Nginx UI Unauthenticated Backup Download & Admin Account Creation Mar 14, 2026

Executive ViewAI

Why It Matters

Nginx UI versions 2.3.3 and earlier contain a critical authentication bypass vulnerability (CVE-2026-27944) that allows unauthenticated attackers to access and manipulate critical functions. With a CVSS score of 9.8, an active public exploit, and no available patch, any organization running affected Nginx UI versions faces immediate risk of unauthorized system access, configuration changes, and potential service disruption.

Business Impact: Severe

Compensating Controls

Implement strict network segmentation to limit access to Nginx UI to trusted administrative networks only; deploy a WAF with rules to block unauthenticated requests to critical UI endpoints; disable the Nginx UI service entirely if not essential to operations; monitor access logs for suspicious authentication bypass attempts; consider reverse proxy authentication or IP allowlisting; maintain offline backups of configurations to enable rapid recovery if unauthorized changes occur.

Threat Intelligence Overview

EPSS Score

1.0%

Top 23% exploitable

Exploit

POC

Public exploit code exists

Data Quality

6 sources

Confidence: High

NVD

CVE.org

EPSS POC (1) Vendor

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 1.0%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*

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Same weakness CWE-306 – Missing Authentication for Critical Function

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Vendor StatusVendor

SUSE

Severity: Critical

References

Advisories & patches

ADVISORY https://vuldb.com/?id.349241 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1042/

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