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Vulnerability record · CVE-2026-33028 · published 30 March 2026

CVE-2026-33028: Nginxui nginx ui race condition vulnerability

Nginxui · Nginx Ui

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui application is vulnerable to a Race Condition. Due to the complete absence of synchronization mechanisms (Mutex) and non-atomic file writes, concurrent requests lead to the severe corruption of the primary configuration file (app.ini). This vulnerability results in a persistent Denial of Service (DoS) and introduces a non-deterministic path for Remote Code Execution (RCE) through configuration cross-contamination. This issue has been patched in version 2.3.4.

7.1 CVSS 4.0 High EPSS 0.59% · top 53.9% CWE-362 · Race condition
7.1CVSS 4.0 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui application is vulnerable to a Race Condition. Due to the complete absence of synchronization mechanisms (Mutex) and non-atomic file writes, concurrent requests lead to the severe corruption of the primary configuration file (app.ini). This vulnerability results in a persistent Denial of Service (DoS) and introduces a non-deterministic path for Remote Code Execution (RCE) through configuration cross-contamination. This issue has been patched in version 2.3.4.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.4 ProductRelease Notes
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-m468-xcm6-fxg4 ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2026-44015Nginxui nginx ui server-side request forgery (ssrf) vulnerabilityNginx UI is a web user interface for the Nginx web server. In 2.3.4 and earlier, an authenticated user can perform Server-Side Request Forgery (SSRF)…EPSS 0.39%9.9CVE-2026-33030Nginxui nginx ui os command injection vulnerabilityNginx UI is a web user interface for the Nginx web server. In versions 2.3.3 and prior, Nginx-UI contains an Insecure Direct Object Reference (IDOR) …EPSS 0.38%9.8CVE-2026-42221Nginxui nginx ui missing authentication for critical function vulnerabilityNginx UI is a web user interface for the Nginx web server. From version 2.0.0 to before version 2.3.8, an unauthenticated network attacker can claim …EPSS 1.6%9.8CVE-2026-42222Nginxui nginx ui improper access control vulnerabilityNginx UI is a web user interface for the Nginx web server. In version 2.3.5, an unauthenticated bootstrap takeover exists in nginx-ui during the init…EPSS 0.47%9.8CVE-2026-33032Nginxui nginx ui missing authentication for critical function vulnerabilityNginx UI is a web user interface for the Nginx web server. In versions 2.3.5 and prior, the nginx-ui MCP (Model Context Protocol) integration exposes…EPSS 2.5%9.8CVE-2026-27944Nginxui nginx ui missing authentication for critical function vulnerabilityNginx 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 …EPSS 1.0%9.8CVE-2024-23827Nginxui nginx ui path traversal vulnerabilityNginx-UI is a web interface to manage Nginx configurations. The Import Certificate feature allows arbitrary write into the system. The feature does n…EPSS 0.70%9.4CVE-2026-33026Nginxui nginx ui cleartext storage of sensitive data vulnerabilityNginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui backup restore mechanism allows attackers to tamper w…EPSS 0.21%

Source: NIST National Vulnerability Database (record CVE-2026-33028), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.