CVE-2026-42222
nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover
CRITICAL 9.8EPSS 0.5%
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
- 0xJacky · nginx-ui
- CVSS v3.1 NVD
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v3.1 GITHUB
- 8.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.47% chance of exploitation in the next 30 days, 40th percentile
- Published
- 2026-05-04
- Updated
- 2026-05-06