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This security vulnerability stems from improper privilege management and session handling logic within the pyLoad-ng application interface. Specifically, when an administrator revokes a user’s privileges or changes a password through the core REST API endpoints, the application updates the database records immediately but fails to invalidate the associated active Flask session cookies. Because user permissions are cached inside the session data at login and read directly on subsequent requests rather than re-verified against the database on each call, stale sessions retain their elevated capabilities for an extended duration. Although a prior patch addressed this behavior for specific WebUI form blueprints, the exposed core API routes bypass session termination entirely, allowing demoted users or evicted accounts to maintain administrative access and execute sensitive actions.
DailyCVE Form:
Platform: pyLoad-ng
Version: 0.5.0b3.dev101
Vulnerability : Privilege-Bypass
Severity: Critical
date: 2026-06-01
Prediction: 2026-06-15
What Undercode Say:
Showing bash commands and codes related to the blog
curl -X POST "http://localhost:8000/api/set_user_permission" -d "user=admin&role=1&per=0" curl -X POST "http://localhost:8000/api/change_password" -d "user=admin&new_password=secret"
Vulnerable session check pattern in webui/app/helpers.py
def session_check():
role = session.get('role')
perms = session.get('perms')
return role, perms
How Exploit: (Educational Purposes!)
An authenticated attacker or demoted administrator can exploit this flaw by issuing a request to the unpatched core API endpoint `/api/set_user_permission` or /api/change_password. Even though the database modifies the user’s role or password immediately, the lack of session destruction lets the attacker continue using the old session cookie. This permits unauthorized execution of restricted functions, such as modifying configuration values via `/api/set_config_value` or accessing protected paths like /settings.
Protection: from this CVE
To secure the application against this vulnerability, upgrade pyLoad-ng to the latest patched version where core API actions invoke session file deletion uniformly. Ensure that session validation routines check database permissions dynamically on critical requests or explicitly invalidate all active Flask session handles when role assignments or credentials are modified.
Impact:
Successful exploitation of this flaw leads to broken access control, privilege persistence, and failure of administrative revocation mechanisms. An attacker whose account privileges have been downgraded or whose password has been rotated can continue performing administrative tasks and unauthorized operations for up to a month or until the session naturally expires.
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Sources:
Reported By: github.com
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