Vulnerability · Published May 4, 2026 · Assigned by GitHub_M
CVE-2026-42222nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover
High 8.1
In plain English
A high-severity missing authentication in nginx-ui from 0xJacky. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.3%top 72.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Nginx 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 initial installation window exposed by POST /api/install. At time of publication no public patches are available.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/0xJacky/nginx-ui | no fix listed | GHSA-mxqh-q9h6-v8pq |
| Go | github.com/0xJacky/nginx-ui | no fix listed | GO-2026-5521 |
Affected products (as reported)
Weakness: CWE-306, CWE-284 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-mxqh-q9h6-v8pq x_refsource_CONFIRM