CVE-2026-84319 json
Nginx UI: MCP configuration tools bypass restricted directive validation and allow secondary authenticated users to execute NJS in Nginx worker context
published 30d ago modified 23d ago also EUVD-2026-97905 , GHSA-5r62-gj48-897x , GO-2026-6774
- cvss
- 8.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/0xJacky/Nginx-UI 1.9.10-0.20260703131214-23d1934099b0
- nginxui nginx_ui 2.4.1
Is CVE-2026-84319 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 29d ago
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H |
| GitHub | 3.1 | 8.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/0xJacky/Nginx-UI | <1.9.10-0.20260703131214-23d1934099b0 |
1.9.10-0.20260703131214-23d1934099b0 |
Affected products
- 0xJacky nginx-ui
Classification
- Weakness
-
- CWE-693 Protection Mechanism Failure
References
-
github.com
/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2
web
-
github.com
/0xJacky/nginx-ui/security/advisories/GHSA-5r62-gj48-897x
web, advisory
-
github.com
/0xJacky/nginx-ui/releases/tag/v2.4.1
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-84319
advisory
-
github.com
/0xJacky/nginx-ui
package
Sources
- CVE List CVE-2026-84319
- GitHub Advisory GHSA-5r62-gj48-897x
- NVD CVE-2026-84319
- OSV GO-2026-6774
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.