CVE-2026-84321 · GHSA-wq4w-vwvq-q3x9
Nginx UI: Standalone short tokens survive administrative revocation in cache and authenticate again after account re-enable
- Risk score
- 45/100
- CVSS
- 5.4 v3.1
- Exploit chance (30 days)
- 0.2%
- Published
- 12 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, GenerateShortToken creates standalone short-token records without a long Token value, but DeleteUserTokens invalidates cached entries only when the long Token field is nonempty. A revoked short token can therefore remain in the short_token cach…
- Affected
- github.com/0xJacky/Nginx-UI (go) < 1.9.10-0.20260703131214-23d1934099b0
- Fix
- Upgrade github.com/0xJacky/Nginx-UI to 1.9.10-0.20260703131214-23d1934099b0 or later.
- Exploitation
- No known exploitation
Story map
At a glance
github.com/0xJacky/Nginx-UI: Amber, patch this week. Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, config.ValidateConfigDirectives splits configuration by newline and checks only the first directive token on each line even though Nginx permits multiple semicolon-separated directives on one line. An authenticated caller can place a benign dir…
The flaws
- CVE-2026-84321: Nginx UI: Standalone short tokens survive administrative revocation in cache and authenticate again after account re-enable (CVSS 5.4 · EPSS 0%)
- CVE-2026-84316: Nginx UI: nginx config directive denylist (ValidateConfigFile) is bypassable via same-line ";" separation → authenticated directive injection (RCE on the official image) (CVSS 8.8 · EPSS 1%)
- CVE-2026-84317: Nginx UI: MCP nginx_config_add skips config directive validation → authenticated nginx directive injection (RCE on the official image) (CVSS 8.8 · EPSS 0%)
- CVE-2026-84318: Nginx UI: MCP `nginx_config_add` Bypasses Directive Validation — Authenticated RCE (CVSS 8.8 · EPSS 1%)
The fix
Upgrade github.com/0xJacky/Nginx-UI: 2.4.1 or later on your release line
Who is exposed: github.com/0xJacky/Nginx-UI (go) < 1.9.10-0.20260703131214-23d1934099b0
Where it stands
- Public proof of concept
Connects to
- Same weakness: CWE-613 (CWE-613). 35 other warnings in 30 days
Why it is Yellow
- CVSS 5.4 medium
- On your watchlist: nginx, Go
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| github.com/0xJacky/Nginx-UI | go | < 1.9.10-0.20260703131214-23d1934099b0 | 1.9.10-0.20260703131214-23d1934099b0 |
References
- https://github.com/advisories/GHSA-wq4w-vwvq-q3x9
- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-wq4w-vwvq-q3x9
- https://nvd.nist.gov/vuln/detail/CVE-2026-84321
- https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2
- https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1
- https://github.com/advisories/GHSA-wq4w-vwvq-q3x9
Original description
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, GenerateShortToken creates standalone short-token records without a long Token value, but DeleteUserTokens invalidates cached entries only when the long Token field is nonempty. A revoked short token can therefore remain in the short_token cache and authenticate again if the associated account is re-enabled before the cache entry expires because GetTokenUserByShortToken reads the surviving entry, restoring access to HTTP or WebSocket routes that accept short-token authentication. This issue is fixed in version 2.4.1.
Last activity 12 Oct 2026. Patch Forecast updates every hour.