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Ad Tech Firm Optimizely Hit by Data Breach After Vishing Attack

Thousands of Businesses Potentially Affected by Phishing Incident

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Optimizely, a leading ad tech firm with over 10,000 business customers, including high-profile brands like H&M, PayPal, and Nike, has confirmed a data breach after a voice phishing attack compromised some of its...

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  1. Source 1 · Fulqrum Sources

    Ad tech firm Optimizely confirms data breach after vishing attack

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🔒 Security Alert

Ad Tech Firm Optimizely Hit by Data Breach After Vishing Attack

Thousands of Businesses Potentially Affected by Phishing Incident

Monday, February 23, 2026 • 3 min read • 1 source reference

  • 3 min read
  • 1 source reference

Optimizely, a leading ad tech firm with over 10,000 business customers, including high-profile brands like H&M, PayPal, and Nike, has confirmed a data breach after a voice phishing attack compromised some of its systems. The company, which has nearly 1,500 employees across 21 global offices, notified an undisclosed number of customers of the breach, stating that the attackers stole "basic business contact information."

According to breach notification letters sent to affected customers, the threat actors reached out to Optimizely on February 11, claiming they had access to its systems. The company has since confirmed that the attackers did indeed breach some of its systems, but was unable to escalate privileges, install software, or create any backdoors in the Optimizely environment.

Optimizely has assured customers that it has no evidence that the threat actor was able to access sensitive information, such as financial data or personal identifiable information. However, the breach has raised concerns among its customers, many of whom are household names.

The attack is believed to have been carried out through a sophisticated voice phishing, or "vishing," campaign, where attackers use social engineering tactics to trick employees into divulging sensitive information or gaining access to company systems. This type of attack is becoming increasingly common, with many companies falling victim to similar tactics in recent years.

In a statement to BleepingComputer, Optimizely said that it had taken immediate action to contain the breach and had notified affected customers. The company has also launched an investigation into the incident and is working with law enforcement to identify the perpetrators.

The breach is a significant concern for Optimizely's customers, many of whom rely on the company's services to manage their online advertising campaigns. The incident highlights the importance of robust cybersecurity measures and employee training to prevent similar attacks in the future.

Optimizely has not disclosed the exact number of customers affected by the breach, but it is believed to be in the thousands. The company has assured customers that it is taking steps to prevent similar incidents in the future and has offered support to those affected.

The incident serves as a reminder of the importance of cybersecurity in the digital age. As companies increasingly rely on online services to manage their operations, the risk of cyber attacks and data breaches grows. It is essential for companies to prioritize cybersecurity and take proactive measures to protect themselves and their customers from these types of attacks.

In the aftermath of the breach, Optimizely has faced questions about its cybersecurity measures and how it plans to prevent similar incidents in the future. The company has assured customers that it takes the security of its systems and data seriously and is committed to protecting its customers' information.

The incident is a significant concern for the ad tech industry as a whole, which has faced numerous high-profile data breaches in recent years. The breach highlights the need for companies to prioritize cybersecurity and take proactive measures to protect themselves and their customers from these types of attacks.

In conclusion, the data breach at Optimizely is a significant incident that highlights the importance of cybersecurity in the digital age. The company's customers, many of whom are household names, are likely to be concerned about the security of their data, and the incident serves as a reminder of the need for robust cybersecurity measures and employee training to prevent similar attacks in the future.

Optimizely, a leading ad tech firm with over 10,000 business customers, including high-profile brands like H&M, PayPal, and Nike, has confirmed a data breach after a voice phishing attack compromised some of its systems. The company, which has nearly 1,500 employees across 21 global offices, notified an undisclosed number of customers of the breach, stating that the attackers stole "basic business contact information."

According to breach notification letters sent to affected customers, the threat actors reached out to Optimizely on February 11, claiming they had access to its systems. The company has since confirmed that the attackers did indeed breach some of its systems, but was unable to escalate privileges, install software, or create any backdoors in the Optimizely environment.

Optimizely has assured customers that it has no evidence that the threat actor was able to access sensitive information, such as financial data or personal identifiable information. However, the breach has raised concerns among its customers, many of whom are household names.

The attack is believed to have been carried out through a sophisticated voice phishing, or "vishing," campaign, where attackers use social engineering tactics to trick employees into divulging sensitive information or gaining access to company systems. This type of attack is becoming increasingly common, with many companies falling victim to similar tactics in recent years.

In a statement to BleepingComputer, Optimizely said that it had taken immediate action to contain the breach and had notified affected customers. The company has also launched an investigation into the incident and is working with law enforcement to identify the perpetrators.

The breach is a significant concern for Optimizely's customers, many of whom rely on the company's services to manage their online advertising campaigns. The incident highlights the importance of robust cybersecurity measures and employee training to prevent similar attacks in the future.

Optimizely has not disclosed the exact number of customers affected by the breach, but it is believed to be in the thousands. The company has assured customers that it is taking steps to prevent similar incidents in the future and has offered support to those affected.

The incident serves as a reminder of the importance of cybersecurity in the digital age. As companies increasingly rely on online services to manage their operations, the risk of cyber attacks and data breaches grows. It is essential for companies to prioritize cybersecurity and take proactive measures to protect themselves and their customers from these types of attacks.

In the aftermath of the breach, Optimizely has faced questions about its cybersecurity measures and how it plans to prevent similar incidents in the future. The company has assured customers that it takes the security of its systems and data seriously and is committed to protecting its customers' information.

The incident is a significant concern for the ad tech industry as a whole, which has faced numerous high-profile data breaches in recent years. The breach highlights the need for companies to prioritize cybersecurity and take proactive measures to protect themselves and their customers from these types of attacks.

In conclusion, the data breach at Optimizely is a significant incident that highlights the importance of cybersecurity in the digital age. The company's customers, many of whom are household names, are likely to be concerned about the security of their data, and the incident serves as a reminder of the need for robust cybersecurity measures and employee training to prevent similar attacks in the future.

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Ad tech firm Optimizely confirms data breach after vishing attack

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