Trust Portal

On October 21, 2026, the Node.js project disclosed CVE-2026-111497, a high-severity vulnerability in the Brotli decoder bundled with Node.js.

The vulnerability is an out-of-bounds write that can be triggered when an application decompresses specially crafted Brotli data. Depending on the application and deployment environment, successful exploitation could cause a process crash, disclose process memory, or potentially allow remote code execution.

Contentsquare has successfully completed all remediation efforts regarding this vulnerability. We have upgraded and patched all Node.js runtimes across our infrastructure to the secure versions. Additionally, we have concluded our investigation into other components utilizing the Brotli decoder and can confirm that our systems are fully patched. Contentsquare is no longer vulnerable to or impacted by this issue.

No customer action is required, and we consider this matter closed.

We remain committed to the highest standards of security and transparency. If you have any questions or require a formal written confirmation, please contact us at security@contentsquare(.)com.

Sincerely,
The Contentsquare Security Team

Dear Customers,

Contentsquare was notified of CVE-2026-109618 and CVE-2026-109619, two critical vulnerabilities affecting PHP workloads and potentially allowing unauthenticated remote code execution in vulnerable PHP environments.

Following notification, we conducted an assessment of our production environment, including a review of our deployed workloads and application components. Based on this analysis, we confirmed that Contentsquare does not use or operate any PHP workloads or PHP runtime components.

As the affected technology is not present in our environment, Contentsquare is not impacted by CVE-2026-109618 or CVE-2026-109619. No remediation or customer action is required in relation to these vulnerabilities.

We remain committed to the highest standards of security and transparency. If you have any questions or require a formal written confirmation, please contact us at security@contentsquare(.)com.

Sincerely,
The Contentsquare Security Team

Dear Customers,

Following the public disclosure on April 29, 2026 of a critical Linux kernel vulnerability tracked as CVE-2026-31431 and nicknamed “Copy Fail”, we immediately initiated a comprehensive assessment of all potentially affected systems and infrastructure.

We are writing to confirm that Contentsquare services and customer data remain secure. Specifically:

• Proactive Assessment & Rapid Response: Upon identification of CVE-2026-31431, our security team promptly invoked our incident response protocol. We conducted a thorough scope assessment across our full infrastructure, including all Linux-based systems and workloads. Interim mitigations were applied immediately while awaiting official patches from our vendors.

• Patch Deployment Near Complete: We are pleased to confirm that the vast majority of our production systems and services have been successfully patched against CVE-2026-31431, with zero downtime and zero failed deployments throughout the process. A small number of remaining workloads are actively being remediated and are expected to reach full patch coverage imminently.

• No Impact on Customer Data: Our investigation confirms that no customer data was accessed, exfiltrated, or impacted as a result of this vulnerability. No breach or unauthorized access has been identified within our systems or those of our sub-processors.

• Ongoing Monitoring: We’re continuously monitoring all systems for any signs of exploitation, and any newly identified affected assets are being remediated without delay.

We remain committed to the highest standards of security and transparency. If you have any questions or require a formal written confirmation, please contact us at security@contentsquare(.)com.

Sincerely,
The Contentsquare Security Team

Dear Customers,

Following recent supply chain attack reports regarding specific compromised Axios releases, our security team performed a comprehensive audit of our development and build environments.

We are writing to confirm that Contentsquare services and customer data remain secure.

We are also writing to confirm the following:

• Proactive Mitigation: Upon identification of the affected package versions, we immediately invoked our incident response protocol. As a standard proactive security best practice, we completed a comprehensive rotation of internal credentials and environment secrets to ensure the continued integrity of our systems.

• No Impact on Customer Data: Our investigation confirms that no customer data was accessed or impacted. The scope was limited to internal build processes, which have since been cleared.

• Supply Chain Resilience: To further harden our environment, we have formalized new security policies requiring stricter version-pinning and a minimum release age requirement for all third-party dependencies. We are currently implementing these architectural controls to further minimize exposure to future supply chain risks.

We remain committed to transparency and the highest standards of data protection. If you have any questions, please contact us at security@contentsquare(.)com.

Sincerely,
The Contentsquare Security Team