pyLoad has Stale Session Privilege After Role/Permission Change (Privilege Revocation Bypass)
Summary
pyLoad caches role and permission in the session at login and continues to authorize requests using these cached values, even after an admin changes the user's role/permissions in the database.
As a result, an already logged-in user can keep old (revoked) privileges until logout/session expiry, enabling continued privileged actions.
This is a core authorization/session-consistency issue and is not resolved by toggling an optional security feature.
Details
The WebUI auth flow stores authorization state in session:
src/pyload/webui/app/helpers.py:187-200set_session(...)writes:"role": user_info["role"]"perms": user_info["permission"]
Authorization checks later trust cached session values:
src/pyload/webui/app/helpers.py:134-151parse_permissions(...)readssession.get("role")/session.get("perms")
src/pyload/webui/app/helpers.py:225-230is_authenticated(...)only verifiesauthenticatedandapi.user_exists(user)(existence), not fresh role/permission
src/pyload/webui/app/helpers.py:267-275login_required(...)usesparse_permissions(s)for allow/deny decisions
src/pyload/webui/app/helpers.py:356-365- API session auth path also trusts
s["role"]ands["perms"]
- API session auth path also trusts
Role/permission updates are written to DB but active sessions are not invalidated/refreshed:
src/pyload/webui/app/blueprints/json_blueprint.py:389-434update_users(...)callsapi.set_user_permission(...)and returns
src/pyload/core/api/__init__.py:1643-1645set_user_permission(...)updates DB role/permission only
Default exposure window is long:
src/pyload/core/config/default.cfg:47session_lifetime = 44640minutes (~31 days)
Therefore, privilege revocation is not enforced immediately for active sessions.
Note on duplicates:
- This appears distinct from CVE-2023-0227 (session validity after user deletion) because this report is about stale authorization after role/permission changes while the user still exists.
PoC
#!/usr/bin/env python3
"""
Repro: stale session privilege after role/permission changes.
This PoC is source-based and leaves no persistent state.
It validates that:
1) Role/permission are cached into session at login.
2) Authorization checks read role/permission from session, not fresh DB values.
3) User updates write DB permission/role without invalidating active sessions.
4) Default session lifetime is long, increasing stale-privilege exposure window.
"""
from __future__ import annotations
import pathlib
import re
from typing import Iterable
ROOT = pathlib.Path(__file__).resolve().parent / "pyload" / "src" / "pyload"
def read(rel: str) -> str:
return (ROOT / rel).read_text(encoding="utf-8")
def has_any(text: str, patterns: Iterable[str]) -> bool:
return all(re.search(p, text, re.MULTILINE) for p in patterns)
def main() -> None:
helpers = read("webui/app/helpers.py")
json_blueprint = read("webui/app/blueprints/json_blueprint.py")
api_init = read("core/api/__init__.py")
default_cfg = (ROOT / "core/config/default.cfg").read_text(encoding="utf-8")
checks = {
"set_session_caches_role_perms": has_any(
helpers,
[
r'def\\s+set_session\\(',
r'"role"\\s*:\\s*user_info\\["role"\\]',
r'"perms"\\s*:\\s*user_info\\["permission"\\]',
],
),
"is_authenticated_only_checks_user_exists": has_any(
helpers,
[
r'def\\s+is_authenticated\\(',
r'api\\s*=\\s*flask\\.current_app\\.config\\["PYLOAD_API"\\]',
r'return\\s+authenticated\\s+and\\s+api\\.user_exists\\(user\\)',
],
),
"parse_permissions_reads_session_cache": has_any(
helpers,
[
r'def\\s+parse_permissions\\(',
r'session\\.get\\("role"\\)\\s*==\\s*Role\\.ADMIN',
r'session\\.get\\("perms"\\)',
],
),
"login_required_uses_parse_permissions_session": has_any(
helpers,
[
r'def\\s+login_required\\(',
r'if\\s+is_authenticated\\(s\\):',
r'perms\\s*=\\s*parse_permissions\\(s\\)',
],
),
"api_session_auth_uses_cached_role_perms": has_any(
helpers,
[
r'if\\s+is_authenticated\\(s\\):',
r'"role"\\s*:\\s*s\\["role"\\]',
r'"permission"\\s*:\\s*s\\["perms"\\]',
],
),
"update_users_changes_db_without_session_invalidation": has_any(
json_blueprint,
[
r'def\\s+update_users\\(',
r'api\\.set_user_permission\\(name,\\s*data\\["permission"\\],\\s*data\\["role"\\]\\)',
r'return\\s+jsonify\\(True\\)',
],
),
"set_user_permission_only_updates_db": has_any(
api_init,
[
r'def\\s+set_user_permission\\(',
r'self\\.pyload\\.db\\.set_permission\\(user,\\s*permission\\)',
r'self\\.pyload\\.db\\.set_role\\(user,\\s*role\\)',
],
),
"default_session_lifetime_long": re.search(
r'session_lifetime\\s*:\\s*"Session lifetime \\(minutes\\)"\\s*=\\s*44640',
default_cfg,
re.MULTILINE,
)
is not None,
}
for name, ok in checks.items():
print(f"{name}={ok}")
stale_privilege_repro_success = all(checks.values())
print(f"stale_privilege_repro_success={stale_privilege_repro_success}")
# Cleanup: this PoC creates/modifies no runtime/data files.
print("cleanup_done=True")
if __name__ == "__main__":
main()
set_session_caches_role_perms=True
is_authenticated_only_checks_user_exists=True
parse_permissions_reads_session_cache=True
login_required_uses_parse_permissions_session=True
api_session_auth_uses_cached_role_perms=True
update_users_changes_db_without_session_invalidation=True
set_user_permission_only_updates_db=True
default_session_lifetime_long=True
stale_privilege_repro_success=True
cleanup_done=True
Impact
- Privilege revocation is not immediate for active sessions.
- A user can continue using stale, previously granted privileges (including admin) after downgrade/restriction.
- This can allow continued access to privileged WebUI/API actions until session expiry or manual logout/session reset.
Software afectado
Haz clic en una tecnología para ver todas sus vulnerabilidades.
| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | pyload-ng | <= 0.5.0b3.dev97 | sin corrección |
Referencias
- https://github.com/pyload/pyload/security/advisories/GHSA-66hx-chf7-3332
- https://nvd.nist.gov/vuln/detail/CVE-2026-41133
- https://github.com/pyload/pyload/commit/e95804fb0d06cbb07d2ba380fc494d9ff89b68c1
- https://github.com/pyload/pyload
- https://pypi.org/project/pyload-ng
- https://github.com/advisories/GHSA-66hx-chf7-3332
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-613- Plataforma
- Python (PyPI)
- Paquete
pyload-ng- Publicada
- 14.04.2026
- Actualizado
- 11.10.2026 14:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-2990 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-66hx-chf7-3332 - CC BY 4.0
Historial de vulnerabilidades: pyload-ng
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 58
- Primera → última
- 01.2023 10.2026
- Sin corrección
- 24
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 9
- Alta 23
- Media 25
- Baja 1
Divulgaciones por año
- 2023: 9
- 2024: 8
- 2025: 8
- 2026: 33
-
pyLoad has Stale Session Privilege After Role/Permission Change (Privilege Revocation Bypass) esta entrada
Identifica las vulnerabilidades de tu aplicación
Con la integración de DockRay y el inventario de software activado, DockRay compara las versiones notificadas de los componentes con las vulnerabilidades conocidas y avisa de las coincidencias confirmadas. La cobertura depende de la tecnología compatible y de los avisos disponibles.