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Under Active Attack

Executive Summary

In September 2026, attackers compromised Brevo's Cloudflare API key and deployed malicious Workers that injected ClickFix scripts into the company's websites and customer-embedded JavaScript components for approximately 5.5 hours. The attack affected brevo.com, sendinblue.com, and customer sites using Brevo forms, conversation widgets, and SDK loaders, potentially impacting up to 100,000 websites. Victims were presented with fake Cloudflare verification pages prompting them to execute malicious commands, while WordPress administrators faced additional risks through backdoor plugin installations that created persistent access points with hardcoded authentication bypasses.

This incident highlights the growing sophistication of supply-chain attacks targeting content delivery networks and the increasing prevalence of ClickFix social engineering tactics that exploit user trust in legitimate cloud services to distribute malware at scale.

Why This Matters Now

Supply-chain attacks targeting CDN infrastructure are escalating as attackers exploit the widespread trust in cloud services and the difficulty of detecting edge-based content manipulation, making comprehensive egress controls and traffic inspection critical for preventing similar compromises.

Attack Path Analysis

MITRE ATT&CK® Techniques

Potential Compliance Exposure

Sector Implications

Sources

Frequently Asked Questions

Attackers obtained a hardcoded Cloudflare API key with full account permissions from Brevo's application source code, allowing them to create malicious Workers that modified content at the CDN edge without triggering alerts.

Cloud Native Security Fabric Mitigations and ControlsCNSF

Based on the attack progression modeled above, these are the defensive controls that would constrain each stage.

Aviatrix Zero Trust CNSF would likely reduce the blast radius and lateral spread of this supply chain attack by constraining cross-zone access and implementing segmented policies for API-driven resource creation. The segmentation controls could limit how compromised credentials enable widespread infrastructure modifications across multiple domains.

Initial Compromise

Control: Cloud Native Security Fabric (CNSF)

Mitigation: Identity-aware access controls may have limited the scope of API key permissions and constrained which cloud resources could be modified through automated policy enforcement across the fabric.

Privilege Escalation

Control: Zero Trust Segmentation

Mitigation: Zero trust segmentation policies could constrain the attacker's ability to create workers across multiple zones and limit cross-domain resource modification through identity-scoped access controls.

Lateral Movement

Control: East-West Traffic Security

Mitigation: East-west traffic controls may have constrained the lateral spread of malicious workers across domain boundaries and reduced the reachability between different organizational zones and customer environments.

Command & Control

Control: Multicloud Visibility & Control

Mitigation: Centralized visibility controls could have detected and constrained suspicious outbound connections to attacker-controlled domains and limited the establishment of persistent command channels through policy enforcement.

Exfiltration

Control: Egress Security & Policy Enforcement

Mitigation: Controlled egress policies may have limited the attacker's ability to exfiltrate stolen credentials and constrained outbound data flows to unauthorized external destinations through enforced security boundaries.

Impact (Mitigations)

While CNSF segmentation would likely reduce the overall blast radius, residual impact may still affect a constrained subset of customer sites that were reached before security controls fully contained lateral spread.

Impact at a Glance

Affected Business Functions

  • Email Marketing Campaigns
  • Customer Relationship Management
  • Web Forms and Lead Generation
  • Customer Communication Widgets
Operational Disruption

Estimated downtime: 1 days

Financial Impact

Estimated loss: N/A

Data Exposure

Up to 100,000 websites were potentially affected by malicious JavaScript injection. WordPress administrator credentials were compromised on sites where admins visited affected pages while logged in. The attack deployed ClickFix social engineering tactics to distribute malware to end users and installed persistent backdoor plugins on WordPress sites.

Recommended Actions

  • • Implement Zero Trust Segmentation to prevent lateral movement between cloud zones and limit API key scope through least privilege access controls
  • • Deploy Egress Security & Policy Enforcement to block unauthorized outbound connections to attacker-controlled domains and prevent data exfiltration
  • • Enable Multicloud Visibility & Control to detect anomalous Worker creation, DNS record modifications, and suspicious automation across CDN infrastructure
  • • Utilize Cloud Native Security Fabric (CNSF) for real-time inline inspection of edge modifications and autonomous detection of supply chain compromise indicators
  • • Establish Threat Detection & Anomaly Response capabilities to baseline normal CDN behavior and alert on unauthorized content modifications or security header removal

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