CVE-2026-42221 Details.
Nginx UI <= 2.3.7 - Unauthenticated Installer Exposure
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-42221. What It Means.
Nginx UI 2.0.0 to 2.3.8 contains an authentication bypass caused by unauthenticated access to /api/install during first-run setup, letting remote attackers claim the initial admin account, exploit requires attacker to access the service before legitimate operator.
Affected Product. What Is Hit.
- Vendor
- 0xjacky
- Product
- 0XJACKY Nginx UI
More CVEs In 0XJACKY Nginx UI.
FAQ
Common Questions.
Nginx UI <= 2.3.7 - Unauthenticated Installer Exposure. Nginx UI 2.0.0 to 2.3.8 contains an authentication bypass caused by unauthenticated access to /api/install during first-run setup, letting remote attackers claim the initial admin account, exploit requires attacker to access the service before legitimate operator.
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-42221 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-42221 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update 0XJACKY Nginx UI to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-42221. Atlas does not run a check for it, so nothing here says whether a particular site is affected.