CVE-2026-33031: CWE-284: Improper Access Control in 0xJacky nginx-ui
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.
AI Analysis
Technical Summary
The vulnerability in nginx-ui versions before 2.3.4 allows continued access by disabled users due to failure to revoke or invalidate existing API tokens (JWTs). This improper access control (CWE-284) and insufficient session expiration (CWE-863) enable attackers to maintain privileges and perform unauthorized actions, including creating new accounts. The flaw is fixed in version 2.3.4.
Potential Impact
An attacker who has obtained a valid JWT token before the user account was disabled can maintain access to the system, including reading and modifying protected resources. This undermines the effectiveness of disabling compromised accounts and can lead to persistent unauthorized access and privilege escalation within the nginx-ui environment.
Mitigation Recommendations
Upgrade nginx-ui to version 2.3.4 or later, where this issue is patched. Since the vendor advisory indicates the issue is fixed in version 2.3.4, applying this official fix is the recommended remediation. Patch status is confirmed by the vendor's versioning information.
CVE-2026-33031: CWE-284: Improper Access Control in 0xJacky nginx-ui
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in nginx-ui versions before 2.3.4 allows continued access by disabled users due to failure to revoke or invalidate existing API tokens (JWTs). This improper access control (CWE-284) and insufficient session expiration (CWE-863) enable attackers to maintain privileges and perform unauthorized actions, including creating new accounts. The flaw is fixed in version 2.3.4.
Potential Impact
An attacker who has obtained a valid JWT token before the user account was disabled can maintain access to the system, including reading and modifying protected resources. This undermines the effectiveness of disabling compromised accounts and can lead to persistent unauthorized access and privilege escalation within the nginx-ui environment.
Mitigation Recommendations
Upgrade nginx-ui to version 2.3.4 or later, where this issue is patched. Since the vendor advisory indicates the issue is fixed in version 2.3.4, applying this official fix is the recommended remediation. Patch status is confirmed by the vendor's versioning information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-17T17:22:14.669Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e6941f19fe3cd2cd32c48c
Added to database: 4/20/2026, 9:01:19 PM
Last enriched: 4/20/2026, 9:16:11 PM
Last updated: 4/21/2026, 7:05:25 AM
Views: 10
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