{"cve":"CVE-2026-84318","nvd":{"published":"2026-10-12T21:17:22.360","modified":"2026-10-13T15:17:50.383","status":"Deferred","description":"Nginx UI is a web user interface for the Nginx web server. From 2.0.0-rc.6 until 2.4.1, the MCP tool nginx_config_add writes nginx configuration files to disk and triggers an nginx reload without calling config.ValidateConfigFile. The identical flow in the REST API (POST /api/configs) does call that function and correctly rejects dangerous directives. An authenticated attacker can exploit this gap to write config files containing any blocked directive (perl, js_import, load_module, user root, etc.), bypassing nginx-ui's entire security layer. On a server with the nginx Perl, njs, or Lua module loaded, this is post-authentication Remote Code Execution. This issue is fixed in version 2.4.1.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-693"],"references":["https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2","https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1","https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-9jww-cxg5-rj9m","https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-9jww-cxg5-rj9m"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:58:52.678897993+00:00"},"epss":{"cve":"CVE-2026-84318","score":0.00816,"percentile":0.56817,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-9jww-cxg5-rj9m","url":"https://osv.dev/vulnerability/GHSA-9jww-cxg5-rj9m","summary":"Nginx UI: MCP `nginx_config_add` Bypasses Directive Validation — Authenticated RCE","modified":"2026-10-19T21:41:19.085165566Z","packages":[{"ecosystem":"Go","name":"github.com/0xJacky/Nginx-UI","purl":"pkg:golang/github.com/0xJacky/Nginx-UI","ranges":[">=1.9.10-0.20250506154222-1330888280a2 <1.9.10-0.20260703131214-23d1934099b0"],"fixed":["1.9.10-0.20260703131214-23d1934099b0"]}]},{"id":"GO-2026-6781","url":"https://osv.dev/vulnerability/GO-2026-6781","summary":"Nginx UI: MCP `nginx_config_add` Bypasses Directive Validation — Authenticated RCE in github.com/0xJacky/Nginx-UI","modified":"2026-10-19T21:31:44.962526565Z","packages":[{"ecosystem":"Go","name":"github.com/0xJacky/Nginx-UI","purl":"pkg:golang/github.com/0xJacky/Nginx-UI","ranges":[">=1.9.10-0.20250506154222-1330888280a2 <1.9.10-0.20260703131214-23d1934099b0"],"fixed":["1.9.10-0.20260703131214-23d1934099b0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}