CVE-2026-42221
Nginx-UI: Unauthenticated First-Run Installer Allows Remote Initial Admin Claim in github.com/0xJacky/Nginx-UI
8.1
HIGH
CVSS 3.1
EPSS 0.35%
Description
Nginx-UI: Unauthenticated First-Run Installer Allows Remote Initial Admin Claim in github.com/0xJacky/Nginx-UI. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/0xJacky/Nginx-UI from v2.0.0 before v2.3.8.
How to fix CVE-2026-42221
To remediate CVE-2026-42221, upgrade the affected package to a fixed version below.
- —upgrade to 2.3.8 or later
- —no fix listed
Is CVE-2026-42221 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 2.0.0, < 2.3.8
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |