Customer information may have been compromised, according to Singtel in a filing on Feb 11.
SEE: Singtel and Ericsson to deploy high-end 5G connectivity in Singapore
According to Accellion, the incident is part of a wider concerted attack against users of their file sharing system.
Singtel says it has suspended all use of the system and activated investigations. It is also currently working with cyber security experts and the relevant authorities, including the Cyber Security Agency of Singapore.
“This is an isolated incident involving a standalone third-party system. Our core operations remain unaffected and sound,” it says.
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Shares in Singtel closed flat at $2.40 on Feb 11.
