CVE-2026-33031

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.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0003

Probability of exploitation

0.10%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-284 CWE-284

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
nginxui	nginx_ui	< 2.3.4

References

Advisories & Patches

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

Exploits

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

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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-33031? +

CVE-2026-33031 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0003, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-33031? +

CVE-2026-33031 affects products from nginxui, specifically: nginx_ui. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-33031? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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