The U.K. Information Commissioner’s Office fined South Staffordshire Water’s parent company £963,900 after finding that the Cl0p ransomware group gained access through a phishing email in September 2020 and remained inside the network for about 20 months. The intrusion was discovered only in July 2022 after IT performance issues prompted an internal investigation, which later uncovered a ransom note and the publication of roughly 4.1 TB of stolen data on the dark web affecting 633,887 customers and employees.
The ICO said the breach was enabled by multiple basic security failures, including weak least-privilege controls, limited monitoring, poor vulnerability management, unsupported systems such as Windows Server 2003, and unpatched domain controllers vulnerable to ZeroLogon. Investigators found the attackers moved laterally using a domain administrator account and accessed highly sensitive personal and financial data, including National Insurance numbers and Priority Services Register information that could reveal disabilities; while Cl0p made claims about water supply manipulation, the regulator said its notice did not identify any compromise of operational or water treatment systems.

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On 2026-05-11, the U.K. Information Commissioner's Office announced a £963,900 fine after concluding the breach was enabled by multiple security failings. The regulator said the penalty was reduced by 40% because the company admitted liability early and agreed to settle without appeal.
In August 2022, attackers published about 4.1 terabytes of stolen data on the dark web. The exposed information affected 633,887 people, including customers and employees, and included sensitive personal and financial data such as National Insurance numbers and Priority Services Register information.
In July 2022, IT performance problems prompted an internal investigation that uncovered the attackers' presence in the network after roughly 20 months. The company also later found a ransom note tied to the intrusion.
After the initial breach, the intruders moved laterally using a domain administrator account and exploited the ZeroLogon vulnerability to escalate privileges. The ICO later said weak privilege controls, poor monitoring, outdated systems, and inadequate vulnerability management enabled the prolonged compromise.
In September 2020, an employee opened a malicious attachment from a phishing email, allowing attackers to install malware and gain access to South Staffordshire Water's parent company network.
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