What is CVE-2026-33026?

CVE-2026-33026 is a critical-severity vulnerability in 0xjacky Nginx-Ui, classified under Cleartext Storage of Sensitive Information. CVSS score: 9.1/10. Published 2026-03-30.

How severe is CVE-2026-33026?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in 0xjacky Nginx-Ui

CVE-2026-33026

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui backup restore mechanism allows attackers to tamper with encrypted backup archives and inject malicious configuration during restoration. This issue has been patched in version 2.3.4.

Published 2026-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (10.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.002 · change: -0.001

Affected products

0xjacky Nginx-Ui — versions < 2.3.4
Nginxui nginx Ui

Weakness classification (CWE)

References

github.com/0xJacky/nginx-ui/security/advisories/GHSA-fhh2-gg7w-gwpq (Exploit, Mitigation, Vendor Advisory)
github.com/0xJacky/nginx-ui/releases/tag/v2.3.4 (Product, Release Notes)

Frequently asked questions

What is CVE-2026-33026?: CVE-2026-33026 is a critical-severity vulnerability in 0xjacky Nginx-Ui, classified under Cleartext Storage of Sensitive Information. CVSS score: 9.1/10. Published 2026-03-30.
How severe is CVE-2026-33026?: Critical severity. CVSS v3 base score is 9.1 out of 10.