How severe is CVE-2026-33031?

CVE-2026-33031 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-33031 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33031?

CVE-2026-33031 affects Nginxui Nginx Ui. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33031?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33031 have an EU (EUVD) identifier?

Yes. CVE-2026-33031 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23965.

When was CVE-2026-33031 published?

CVE-2026-33031 was published on 2026-04-20 and last updated on 2026-06-17.

CVE-2026-33031

CVE-2026-33031 is a high-severity vulnerability in Nginxui Nginx Ui with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v4: 8.6
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23965
Weakness: CWE-284
Affected product: Nginxui Nginx Ui
Published: 2026-04-20
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33031?: 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.
How severe is CVE-2026-33031?: CVE-2026-33031 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-33031 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33031?: CVE-2026-33031 affects Nginxui Nginx Ui. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33031?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33031 have an EU (EUVD) identifier?: Yes. CVE-2026-33031 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23965.
When was CVE-2026-33031 published?: CVE-2026-33031 was published on 2026-04-20 and last updated on 2026-06-17.

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-x234-x5vq-cc2v

Affected products (1)

cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*

More vulnerabilities in Nginxui Nginx Ui

CVE-2026-42238 — 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…
CVE-2026-33032 — Critical (CVSS 9.8): Nginx UI is a web user interface for the Nginx web server. In versions 2.3.5 and prior, the nginx-ui MCP (Model Context…
CVE-2026-27944 — Critical (CVSS 9.8): Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.3, the /api/backup endpoint is…
CVE-2024-49368 — Critical (CVSS 9.8): Nginx UI is a web user interface for the Nginx web server. Prior to version 2.0.0-beta.36, when Nginx UI configures…
CVE-2024-23827 — Critical (CVSS 9.8): Nginx-UI is a web interface to manage Nginx configurations. The Import Certificate feature allows arbitrary write into…
CVE-2026-33026 — Critical (CVSS 9.1): Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui backup restore…

All CVEs affecting Nginxui Nginx Ui →

Other CWE-284 (Improper Access Control) vulnerabilities

CVE-2026-50746 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi…
CVE-2026-46978 — Critical (CVSS 10.0): Vulnerability in the Oracle Solaris product of Oracle Systems (component: Remote Administration Daemon). The…
CVE-2026-35308 — Critical (CVSS 10.0): Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Centralized Third Party Jars).…
CVE-2026-35307 — Critical (CVSS 10.0): Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Core). Supported versions that…
CVE-2026-46695 — Critical (CVSS 10.0): Boxlite is a sandbox service that allows users to create lightweight virtual machines (Boxes) and launch OCI containers…
CVE-2026-46840 — Critical (CVSS 10.0): Vulnerability in Oracle REST Data Services (component: Backend-as-a-Service). Supported versions that are affected are…

Browse all CWE-284 (Improper Access Control) vulnerabilities →