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Merged
copybara-service merged 5 commits into from
Aug 29, 2026
Merged

feat(templated):cve-2026-33032 #867

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7e1b1cc
feat(templated):cve-2026-33032
sanjaymahajan14 Jul 15, 2026
5f0b923
Update the description for CVE-2026-33032
sanjaymahajan14 Jul 16, 2026
161c0c1
Update templated/templateddetector/plugins/cve/2026/NginxUI_CVE_2026_…
sanjaymahajan14 Aug 17, 2026
d6f8c4b
Update templated/templateddetector/plugins/cve/2026/NginxUI_CVE_2026_…
sanjaymahajan14 Aug 17, 2026
b87d862
Update templated/templateddetector/plugins/cve/2026/NginxUI_CVE_2026_…
sanjaymahajan14 Aug 17, 2026
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88 changes: 88 additions & 0 deletions templated/templateddetector/plugins/cve/2026/NginxUI_CVE_2026_33032.textproto
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Original file line number Diff line number Diff line change
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# proto-file: proto/templated_plugin.proto
# proto-message: TemplatedPlugin

###############
# PLUGIN INFO #
###############

info: {
type: VULN_DETECTION
name: "NginxUI_CVE_2026_33032"
author: "sanjaymahajan14"
version: "1.0"
}

finding: {
main_id: {
publisher: "GOOGLE"
value: "CVE-2026-33032"
}
severity: CRITICAL
title: "Authentication bypass in Nginx UI MCP endpoint"
description: "Nginx UI versions 2.3.3 and earlier expose the /mcp_message endpoint without authentication when the IP allowlist is empty. A remote unauthenticated attacker can invoke privileged Model Context Protocol (MCP) operations."
recommendation: "Upgrade Nginx UI version 2.3.4 or later. If upgrading is not possible, disable MCP or restrict access using authentication and an IP allowlist. Do not expose Nginx UI directly to the Internet."
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related_id: {
publisher: "CVE"
value: "CVE-2026-33032"
}
}

config: {}

###########
# ACTIONS #
###########

actions: {
name: "fingerprint_nginx_ui"
http_request: {
method: GET
uri: "/"
response: {
http_status: 200
expect_any: {
conditions: [
{ body: {} contains: "Nginx UI" },
{ body: {} contains: "<title>Nginx UI</title>" }
]
}
}
}
}

actions: {
name: "probe_mcp_message"
http_request: {
method: POST
uri: "/mcp_message"
headers: [
{ name: "Accept" value: "application/json" },
{ name: "Content-Type" value: "application/json" }
]
data: "{\"jsonrpc\":\"2.0\",\"method\":\"initialize\",\"params\":{\"protocolVersion\":\"2024-11-05\",\"capabilities\":{},\"clientInfo\":{\"name\":\"{{string}}\",\"version\":\"1.0\"}},\"id\":1}"
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response: {
http_status: 400
expect_all: {
conditions: [
{ body: {} contains: "\"jsonrpc\":\"2.0\"" },
{ body: {} contains: "\"message\":\"Missing sessionId\"" },
{ body: {} contains: "\"id\":null" }
]
}
}
}
}

#############
# WORKFLOWS #
#############

workflows: {
variables: [
{ name: "string" value: "{{to_lower(rand_text_alpha(5))}}" }
]
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actions: [
"fingerprint_nginx_ui",
"probe_mcp_message"
]
}
68 changes: 68 additions & 0 deletions templated/templateddetector/plugins/cve/2026/NginxUI_CVE_2026_33032_test.textproto
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# proto-file: proto/templated_plugin_tests.proto
# proto-message: TemplatedPluginTests

config: {
tested_plugin: "NginxUI_CVE_2026_33032"
}

########
# TESTS #
########

tests: {
name: "whenVulnerable_returnsTrue"
expect_vulnerability: true
mock_http_server: {
mock_responses: [
{
uri: "/"
status: 200
body_content: "<!doctype html>\n<html lang=\"en\">\n <head>\n <title>Nginx UI</title>\n </head>\n <body><div id=\"app\"></div></body>\n</html>"
},
{
uri: "/mcp_message"
status: 400
headers: [
{ name: "Content-Type" value: "application/json" }
]
body_content: "{\"jsonrpc\":\"2.0\",\"id\":null,\"error\":{\"code\":-32602,\"message\":\"Missing sessionId\"}}"
}
]
}
}

tests: {
name: "whenNotVulnerable_returnsFalse"
expect_vulnerability: false
mock_http_server: {
mock_responses: [
{
uri: "/"
status: 200
body_content: "<!doctype html>\n<html><head><title>Nginx UI</title></head></html>"
},
{
uri: "/mcp_message"
status: 403
headers: [
{ name: "Content-Type" value: "application/json" }
]
body_content: "{\"message\":\"Authorization failed\"}"
}
]
}
}

tests: {
name: "whenNotNginxUI_returnsFalse"
expect_vulnerability: false
mock_http_server: {
mock_responses: [
{
uri: "TSUNAMI_MAGIC_ANY_URI"
status: 200
body_content: "Welcome to Apache HTTP Server"
}
]
}
}