CVE-2026-84318: Nginx UI
The National Vulnerability Database (NVD) record says that in Nginx UI from 2.0.0-rc.6 until 2.4.1 the Model Context Protocol (MCP) tool nginx_config_add writes configuration files and reloads nginx without the validation the REST API applies, which on servers with the Perl, njs or Lua module loaded allows post-authentication remote code execution; fixed in 2.4.1.
The record
- Kind
- Vulnerability
- Source record
- CVE-2026-84318: 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_con (National Vulnerability Database record)
- Record published
- 2026-10-12
- Posted here
- 2026-10-13
- World
- Software agents · Enterprise work agents
- Controls concerned
- Pre-execution validation C-D1; Containment and isolation C-E5
- Checked
- Checked against its record on 2026-10-22 by a reader who did not draft it; report
verification/reports/SIG-2026-10-13-001-2026-10-22.md.
A signal's controls are the ones its record points at, the exposure; a case's controls are the ones its records show were absent or failed, so the two can differ.
Corrections
Changes to what this signal says, with the reason. Every earlier version is kept.
- 2026-10-22: Summary. Plain-language rule: abbreviations spelled out at first use (NVD, MCP, SDK). No claim changed. 22 October 2026.
Show the change
Before: The NVD record says that in Nginx UI from 2.0.0-rc.6 until 2.4.1 the MCP tool nginx_config_add writes configuration files and reloads nginx without the validation the REST API applies, which on servers with the Perl, njs or Lua module loaded allows post-authentication remote code execution; fixed in 2.4.1.After: The National Vulnerability Database (NVD) record says that in Nginx UI from 2.0.0-rc.6 until 2.4.1 the Model Context Protocol (MCP) tool nginx_config_add writes configuration files and reloads nginx without the validation the REST API applies, which on servers with the Perl, njs or Lua module loaded allows post-authentication remote code execution; fixed in 2.4.1.
What a signal is. A signal records what a primary record says; it assigns no fault. It is lighter than a case: one dated item from one record, tagged with the world, sector and controls it touches. It becomes a case when it meets the bar for one.
New signals like this, once a week. A short email when a case, signal or rule touches software agents. Free; unsubscribe in one click.
Get the weekly emailNewer: CVE-2026-77366: obsidian-tc
Older: CVE-2026-108865: AmoyLab Unla