Horizon Alert
Summary of the vulnerability and why it matters
Concrete CMS versions prior to 9.5.1 contain a flaw in the bulk user assignment feature. This weakness can allow an authenticated user to gain administrative privileges. The impact could involve unauthorized changes to user group memberships, potentially disrupting operations and affecting access controls.
- Vulnerable: Concrete CMS bulk assignment feature
- Weakness: Missing authorization allows privilege escalation
- Impact: Unauthorized administrative control of user groups
Attack Path
How an attacker could exploit the issue
An attacker can escalate privileges within Concrete CMS by exploiting a missing authorization flaw. This allows any authenticated user with access to the bulk user assignment dashboard to manipulate user group memberships. The attacker can add any user to any group or remove existing administrators, leading to a compromise of system control.
- Exposed dashboard page
- Authenticated user access
- Assign users to groups, remove admins
Live Threat
Current exploitation, exposure, and threat context
This vulnerability in Concrete CMS could allow authenticated users to escalate their privileges and gain administrative access. Attackers could exploit this to add any user to any group or remove legitimate administrators. This could lead to unauthorized control over the system and its data, posing a significant business risk.
- Likely attacker skill level: High.
- Required access or conditions: Authenticated user, dashboard access.
- Business risk or urgency: Significant risk, warrants attention.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Concrete CMS allows authenticated users with access to the bulk user assignment dashboard to escalate privileges. Attackers can add any user email to any group or remove existing administrators. This poses a significant risk to organizational control and data integrity.
- Find affected Concrete CMS assets.
- Limit access to the bulk user assignment dashboard.
- Apply vendor updates, verify, and monitor systems.
