CVE-2026-84319Nginx UI: MCP configuration tools bypass restricted directive validation and allow secondary authenticated users to execute NJS in Nginx worker context
Updated under an hour ago ()
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It affects 0xJacky nginx-ui. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.28%, higher than 19% of scored CVEs.
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Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, the regular HTTP configuration API rejects restricted Nginx directives such as load_module, js_import, and js_content. However, the MCP configuration interface allows a secondary authenticated user to write and apply equivalent restricted configuration content. This allows the user to load ngx_http_js_module.so, import attacker-controlled JavaScript, reload Nginx, and execute NJS in the Nginx worker context. This issue is fixed in version 2.4.1.
- CVSS
- 8.3 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
- Weakness (CWE)
- CWE-693
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.28% (percentile 19)
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Oct 13, 2026
- First seen by InfoSec Signals
- Oct 12, 2026
Affected products
0xJacky nginx-ui 0xjacky:nginx_ui (from the name) | before 2.4.1 | CNA record |
References
- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-5r62-gj48-897xx-refsource-confirm
- https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2x-refsource-misc
- https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.