CVE-2026-33031 Nginx-UI: Disabled users retain full API access through previously issued bearer tokens
Disabled users retain API access via old tokens, allowing attackers to read, modify data, and escalate privileges in Nginx UI.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33031?
CVE-2026-33031 is a high-severity authentication bypass vulnerability in 0xJacky nginx-ui, published on 20 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-33031?
3 open source packages ship an affected version, including github.com/0xJacky/Nginx-UI. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/0xJacky/Nginx-UI Go | All versions | 1.9.10-0.20260314152518-7b66578adb47 |
github.com/0xJacky/Nginx-UI Go | All versions | 1.9.10-0.20260314152518-7b66578adb47 |
github.com/0xJacky/Nginx-UI Go | All versions | 1.9.10-0.20260314152518-7b66578adb47 |
Products include Nginxui Nginx Ui.
How do I fix CVE-2026-33031?
Upgrade github.com/0xJacky/Nginx-UI to 1.9.10-0.20260314152518-7b66578adb47 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-33031 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33031 exists.
Other vulnerabilities in 0xJacky nginx-ui
- CVE-2026-33032 Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
- CVE-2026-27944 Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
- CVE-2024-23827 Nginx-UI arbitrary file write through the Import Certificate feature
- CVE-2026-107806 Nginx UI: Authenticated Remote Code Execution via Backup Restore App Config Overwrite
- CVE-2026-33026 nginx-ui Backup Restore Allows Tampering with Encrypted Backups
Sources
Also known as GHSA-x234-x5vq-cc2v, GO-2026-5733.