Vulnerability · CVE-2026-84317
Nginx UI: MCP nginx_config_add skips config directive validation → authenticated nginx directive injection (RCE on the official image)
Published Oct 15, 2026 · Nginx UI: MCP nginx_config_add
Check if you run it
No confirmed exploitation is on record for CVE-2026-84317. EPSS is 0.38%. Act only if a listed version of Nginx UI: MCP nginx_config_add is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (Nginx UI: MCP nginx_config_add).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Unknown—
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.38%
- Remediation
- Not established
- Affected products
- golang github.com
internal/config/validation.go (ValidateConfigFile) is a security control that blocks dangerous nginx directives — js_ , perl_ , load_module of the njs/perl modules, and user root. It is enforced on three of the four config-write paths: api/config/add.go, api/config/modify.go, and mcp/config/config_modify.go. The fourth path — the MCP tool nginx_config_add (mcp/config/config_add.go) — does NOT call it: it writes the caller-supplied content straight to disk and reloads nginx. An authenticated MCP caller (or an MCP agent induced …
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- golang github.comversion unspecified
How to fix CVE-2026-84317
Recommended remediation
No required-action text, fix commit, or clear fixed-version range is stored yet.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-84317. EPSS is 0.38%. Act only if a listed version of Nginx UI: MCP nginx_config_add is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.38%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 15, 2026 · GitLab Advisory Database
Detected
internal/config/validation.go (ValidateConfigFile) is a security control that blocks dangerous nginx directives — js_ , perl_ , load_module of the njs/perl modules, and user root. It is enforced on three of the four config-write paths: api/config/add.go, api/config/modify.go, and mcp/config/config_modify.go. The fourth path — the MCP tool nginx_config_add (mcp/config/config_add.go) — does NOT call
Sources
- CVE.orgVulnerability recordCVE-2026-84317
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-84317
30-day exploitation probability 0.4%
first.org - GitLab Advisory DatabasePackage advisoryCVE-2026-84317
internal/config/validation.go (ValidateConfigFile) is a security control that blocks dangerous nginx directives — js_ , perl_ , load_module of the njs/perl modules, and user root. It is enforced on three of the four config-write paths: api/config/add.go, api/config/modify.go, and mcp/config/config_modify.go. The fourth path — the MCP tool nginx_config_add (mcp/config/config_add.go) — does NOT call
advisories.gitlab.com
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.