Roundcube

A critical vulnerability in the Roundcube Webmail software allows authenticated attackers to execute arbitrary code remotely. This flaw, discovered through PHP object deserialization issues, affects versions 1.6.x and 1.5.x. Security researcher firs0v reported the flaw, leading to immediate patches in versions 1.6.11 and 1.5.10. Organizations are urged to update to prevent system compromises. The vulnerability enables privilege escalation, data exfiltration, and lateral movement within corporate networks. Successful exploitation can lead to accessing sensitive communications, modifying email configurations, installing backdoors, and pivoting to other internal systems. The email server's position provides valuable intelligence about organizational structure. Immediate remediation is crucial due to increased cyber threats targeting email infrastructure.

Source: https://cybersecuritynews.com/critical-roundcube-vulnerability/

TPRM report: https://scoringcyber.rankiteo.com/company/roundcube-webmail

"id": "rou743060225",
"linkid": "roundcube-webmail",
"type": "Vulnerability",
"date": "6/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"

{'affected_entities': [{'industry': 'Email Services',
                        'location': 'Global',
                        'name': 'Roundcube Webmail',
                        'type': 'Software'}],
 'attack_vector': 'Post-Authentication Remote Code Execution (RCE)',
 'data_breach': {'type_of_data_compromised': 'Sensitive communications, email '
                                             'configurations'},
 'date_publicly_disclosed': '2025-06-01',
 'description': 'A critical vulnerability in the widely used Roundcube Webmail '
                'software allows authenticated attackers to execute arbitrary '
                'code remotely. The vulnerability, discovered through PHP '
                'object deserialization flaws, affects all installations '
                'running versions 1.6.x and 1.5.x.',
 'impact': {'data_compromised': 'Sensitive communications, email '
                                'configurations',
            'systems_affected': 'Email servers'},
 'initial_access_broker': {'entry_point': 'PHP object deserialization'},
 'motivation': 'System compromise, data exfiltration, privilege escalation',
 'post_incident_analysis': {'root_causes': 'Improper handling of serialized '
                                           'objects during session management '
                                           'or data processing operations'},
 'recommendations': ['Immediate patching',
                     'Implementing WAFs',
                     'Network segmentation',
                     'Regular security audits',
                     'Strengthening access controls',
                     'Implementing MFA'],
 'references': [{'source': 'Security researcher firs0v'}],
 'response': {'containment_measures': ['Immediate patching to versions 1.6.11 '
                                       'or 1.5.10',
                                       'Web Application Firewalls (WAFs)',
                                       'Network segmentation',
                                       'Intrusion Detection Systems (IDS)'],
              'remediation_measures': ['Regular security audits',
                                       'Strengthening access controls',
                                       'Implementing multi-factor '
                                       'authentication (MFA)']},
 'threat_actor': 'Authenticated attackers',
 'title': 'Critical Vulnerability in Roundcube Webmail Software',
 'type': 'Vulnerability',
 'vulnerability_exploited': 'PHP object deserialization'}