Secuno
ENNL
Book demo

CVE-2026-33031

Nginxui Nginx UI broken access control

8.1 HIGHPublic exploitEPSS 0.39%
  1. Published20 Apr 2026

Description

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, a user who was disabled by an administrator can use previously issued API tokens for up to the token lifetime. In practice, disabling a compromised account does not actually terminate that user’s access, so an attacker who already stole a JWT can continue reading and modifying protected resources after the account is marked disabled. Since tokens can be used to create new accounts, it is possible the disabled user to maintain the privilege. Version 2.3.4 patches the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

Nginxui Nginx UI< 2.3.4

Remediation

Fixed in
Nginxui Nginx UI≥ 2.3.4

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-163018.5
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.7 before…
CVE-2026-1095598.7
EdgeEver Desktop 1.6.26 through 1.112.0 contains a navigation allowlist bypass that…
CVE-2026-773669.9
obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian…
CVE-2026-1039038.8
An incorrect authorization vulnerability in the WinBox authentication flow of MikroTik…
CVE-2026-1087468.8
Vearch 3.5.2 through 3.5.9 contains an incorrect authorization vulnerability in…
CVE-2026-816499.1
The Fundiin cho WooCommerce WordPress plugin through 3.4.0 does not have proper…

Frequently asked

Is CVE-2026-33031 being actively exploited?

CVE-2026-33031 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.39%.

How severe is CVE-2026-33031?

CVE-2026-33031 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.39% probability of exploitation.

Which products are affected by CVE-2026-33031?

Affected products include Nginxui Nginx UI.

How do I fix CVE-2026-33031?

Upgrade affected software to a fixed version, for example Nginxui Nginx UI 2.3.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33031 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.