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Bt cybersecurity incidents and threat signals
bt.com
This company page brings together public reporting currently associated with Bt. It reflects signals published by Shadow Tier and should not be read as a complete incident history.
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July 2, 2026
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Based on all published signals currently linked to Bt. Affected countries come from victim data; the company country above remains a separate profile fact. Counts describe this reporting set, not overall incident prevalence.
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BT Group's Conferencing Division Hit by Black Basta Ransomware
On December 5, 2024, UK telecommunications giant BT Group confirmed that its BT Conferencing business division was targeted by the Black Basta ransomware group. The incident forced the company to take specific elements of the platform offline and isolate them. Black Basta claimed to have exfiltrated approximately 500 GB of data, including financial, organizational, and user data. BT stated that other BT Group systems and customer services were unaffected.
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What does the Bt page include?
It combines a reviewed organization profile with all current published Shadow Tier signals explicitly linked to Bt.
Does every mention of Bt appear here?
No. A signal must contain a reliable company connection and meet the publication criteria; incidental or ambiguous mentions are excluded.
Why can the incident count change?
The page follows current published reporting. Counts change as new evidence is added, classifications are reviewed, or older signals leave the reporting window.