CVE-2026-42238: Nginx UI is a web user interface for the Nginx web server

Q: How do I fix CVE-2026-42238?

nginx ui: upgrade to 2.3.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-42238 being exploited?

CVE-2026-42238 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42238 affect?

CVE-2026-42238 affects nginx ui. Severity is critical (CVSS 9.8). Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, nginx-ui exposes a backup restore endpoint (POST /api/restore) that is completely unauthenticated during the first 10 minutes after process startup on any fr

Q: How urgent is CVE-2026-42238?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-42238 is a critical-severity flaw (CVSS 9.8) affecting nginx ui. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, nginx-ui exposes a backup restore endpoint (POST /api/restore) that is completely unauthenticated during the first 10 minutes after process startup on any fresh installation. An unauthenticated remote attacker can upload a crafted backup archive that overwrites the application's configuration file (app.ini) and SQLite database. Because the attacker controls the res

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-05-04
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: nginxui

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-04 21:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

nginxui nginx ui UPGRADE

Affected: < 2.3.8

Fixed in: 2.3.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nginx-ui || rpm -q nginx-ui || nginx-ui --version

2. UPGRADE to 2.3.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nginx-ui

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nginx-ui

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Go · github.com/0xJacky/nginx-ui · FIXED · 2.3.8 · vulnerable: < 2.3.8 · source

go get github.com/0xJacky/nginx-ui@v2.3.8 go list -m github.com/0xJacky/nginx-ui

Fedora 46 · mingw-qt5-qtwebkit · FIXED · 5.212.0-0.46.alpha4.fc46 · FEDORA-2026-46ae541c22 · source

sudo dnf upgrade --advisory=FEDORA-2026-46ae541c22

Fedora ELN · kdominate · FIXED · 26.08.2-2.eln159 · FEDORA-2026-b1d98239fd · source

sudo dnf upgrade --advisory=FEDORA-2026-b1d98239fd

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/0xJacky/nginx-ui/security/advisories/GHSA-4pvg-prr3-9cxr

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42238?

nginx ui: upgrade to 2.3.8. Exact commands for each OS are on this page.

Is CVE-2026-42238 being exploited?

CVE-2026-42238 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42238 affect?

CVE-2026-42238 affects nginx ui. Severity is critical (CVSS 9.8). Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, nginx-ui exposes a backup restore endpoint (POST /api/restore) that is completely unauthenticated during the first 10 minutes after process startup on any fr

How urgent is CVE-2026-42238?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

nginx vulnerabilities · SQLite vulnerabilities

References

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