Zendesk was targeted by a **sophisticated phishing campaign** leveraging **Cloudflare Pages** to create convincing fake login screens, impersonating trusted Zendesk interfaces. Attackers tricked users into submitting sensitive credentials, exploiting vulnerabilities in the email support system. The breach exposed **customer data to significant risk**, with potential unauthorized access to personal and account-related information. The incident underscores the growing threat of **evolved phishing tactics** in digital customer support platforms, where third-party tools (like Cloudflare Pages) can be weaponized to bypass traditional security measures. While the exact scale of data compromise remains undisclosed, the attack highlights systemic weaknesses in authentication protocols and the urgent need for **enhanced monitoring, employee training, and multi-layered defenses** to prevent credential harvesting and subsequent data leaks. The reputational and operational impact on Zendesk and its clients could be substantial, given the reliance on secure customer support infrastructure.
Source: https://meyka.com/blog/zendesk-security-breach-phishing-campaign-targets-customer-data-0611/
TPRM report: https://www.rankiteo.com/company/zendesk
"id": "zen5862358110625",
"linkid": "zendesk",
"type": "Breach",
"date": "11/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'industry': 'SaaS (Software as a Service)',
'location': 'Global (HQ in San Francisco, California, '
'USA)',
'name': 'Zendesk',
'type': 'customer support platform'}],
'attack_vector': ['email spoofing',
'fake login pages',
'Cloudflare Pages misuse',
'impersonation of trusted sources'],
'customer_advisories': ['Likely issued (not specified in source)'],
'data_breach': {'data_exfiltration': ['likely (credentials submitted to fake '
'pages)'],
'personally_identifiable_information': ['potential (depends '
'on support ticket '
'content)'],
'sensitivity_of_data': ['high (login credentials, potentially '
'PII in support tickets)'],
'type_of_data_compromised': ['customer credentials',
'support ticket data']},
'description': 'Zendesk was targeted by a sophisticated phishing campaign '
'leveraging Cloudflare Pages to create fake login screens, '
'impersonating trusted sources to harvest sensitive customer '
'data. The attack exploited Zendesk’s email support systems, '
'bypassing typical security measures and highlighting '
'vulnerabilities in digital customer support environments. The '
'incident underscores the need for enhanced cybersecurity '
'protocols, including regular system updates, employee '
'training, and advanced threat detection.',
'impact': {'brand_reputation_impact': ['erosion of customer trust',
'negative perception of security '
'practices'],
'customer_complaints': ['potential increase due to compromised '
'accounts'],
'data_compromised': ['customer credentials',
'sensitive support ticket information'],
'identity_theft_risk': ['high (due to harvested credentials)'],
'operational_impact': ['disruption to customer trust',
'potential operational delays in support '
'services'],
'systems_affected': ['Zendesk email support systems',
'customer login interfaces']},
'initial_access_broker': {'data_sold_on_dark_web': ['potential (credentials '
'likely sold or used for '
'further attacks)'],
'entry_point': ['phishing emails directing to fake '
'Cloudflare Pages-hosted login '
'screens'],
'high_value_targets': ['Zendesk customer support '
'agents',
'end-users with active '
'support tickets']},
'lessons_learned': ['Third-party platforms (e.g., Cloudflare Pages) can be '
'weaponized for phishing if not properly monitored.',
'Customer support systems are high-value targets due to '
'access to sensitive data.',
'User training and MFA are critical defenses against '
'credential harvesting.',
'Regular security audits of email and login systems are '
'essential to detect vulnerabilities.'],
'motivation': ['data theft',
'credential harvesting',
'unauthorized access to customer support systems'],
'post_incident_analysis': {'corrective_actions': ['Tighten integration '
'policies for third-party '
'services like Cloudflare '
'Pages.',
'Roll out mandatory '
'phishing training for '
'employees and customers.',
'Enhance email '
'authentication (DMARC, '
'DKIM, SPF) to prevent '
'spoofing.',
'Implement behavioral '
'analytics to detect '
'anomalous login attempts.'],
'root_causes': ['Insufficient validation of '
'Cloudflare Pages domains '
'mimicking Zendesk.',
'Lack of user awareness about '
'phishing tactics targeting '
'support systems.',
'Possible gaps in email security '
'controls to detect spoofed '
'messages.']},
'recommendations': ['Implement stricter validation for third-party services '
'used in customer-facing workflows.',
'Enforce multi-factor authentication (MFA) for all user '
'logins, especially support agents and customers.',
'Conduct regular phishing simulation exercises for '
'employees and customers.',
'Deploy advanced email filtering and threat detection to '
'identify spoofed messages.',
'Monitor dark web and underground forums for leaked '
'Zendesk credentials.',
'Enhance customer communication to raise awareness of '
'phishing risks and reporting mechanisms.'],
'references': [{'source': 'CX Today', 'url': 'https://www.cxtoday.com/'}],
'response': {'communication_strategy': ['public disclosure via CX Today',
'customer advisories likely issued '
'(not specified)'],
'enhanced_monitoring': ['recommended: advanced threat detection '
'for email and login systems'],
'remediation_measures': ['recommended: enforce multi-factor '
'authentication (MFA)',
'monitor third-party services (e.g., '
'Cloudflare Pages) for misuse',
'enhance employee training on phishing '
'risks']},
'title': 'Zendesk Phishing Campaign Exploiting Cloudflare Pages',
'type': ['phishing', 'social engineering', 'credential harvesting'],
'vulnerability_exploited': ['lack of multi-factor authentication (MFA) '
'enforcement',
'inadequate validation of third-party services '
'(Cloudflare Pages)',
'user susceptibility to phishing']}