Stock Exchange of Thailand Addresses Data Breach Affecting 200,000 Users

According to a report by Prachachat Business on July 29, 2026, the Stock Exchange of Thailand (SET) has issued an apology following a security breach in its TSD Investor Portal system. The incident resulted in the unauthorized exposure of personal data belonging to approximately 200,000 users.

While the leaked information includes bank account and stock account numbers, the SET stated that there is currently no evidence of financial loss or unauthorized transactions resulting from the breach. The organization clarified that the incident is unrelated to the 'Wiset' application. To prevent future occurrences, the SET is implementing enhanced security measures, including the integration of AI-driven code scanning to identify and mitigate vulnerabilities.

For residents and investors in Thailand, this incident serves as a reminder to remain vigilant against potential phishing attempts. Users should be cautious of suspicious links or communications claiming to be from financial institutions. While the SET has confirmed the scope of the leak, the full extent of the exposure and the specific methods used by the attackers remain under investigation. Residents are advised to monitor their financial statements closely and report any suspicious activity to their respective banks or the relevant authorities immediately.