Foster City — Cyber Attacks, Breaches & Threat Activity

Threat entity extracted from intelligence sources

Frequency
7
occurrences
First Seen
March 20, 2026
Last Seen
July 6, 2026

Foster City is a organization tracked across 2 threat clusters and 7 intelligence report mentions on ThreatCluster. First observed March 20, 2026; most recent activity July 6, 2026.

Related Threat Clusters

  • Foster City Faces Ransomware Attack, Declares State of Emergency

    Foster City, California, experienced a ransomware attack on March 19, 2026, disrupting all non-emergency city services. The city's IT staff detected the breach early Thursday morning, leading to a temporary shutdown of…

    12 articles · Updated March 20, 2026
  • Pennington County Closes Offices Due to Cybersecurity Incident

    Pennington County, South Dakota, has closed most public offices following a cybersecurity incident impacting parts of its network. The closures are intended to allow staff to assess the situation and restore affected…

    2 articles · Updated July 6, 2026

Recent Intelligence Reports

  • Pennington County, SD Closes Offices After Cybersecurity Incident — Technadu · July 6, 2026
  • Cyberattack in Foster City shuts down many city services — Nbcbayarea · March 21, 2026
  • Peninsula City Goes Offline Following Ransomware Attack | Foster City, CA Patch — Patch · March 21, 2026
  • Foster City hit by ransomware attack, plans to declare state of emergency — Cbsnews · March 20, 2026
  • Foster City targeted by ransomware attack — Ktvu · March 20, 2026
  • California city reports ransomware attack as LA transit agency finds ‘unauthorized activity’ — Therecord.Media · March 20, 2026
  • Foster City Ransomware Attack Disrupts Non-Emergency Municipal Operations — Technadu · March 20, 2026

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Ransomware City Of Acworth City Of Oak Park Cocoa City Foster City Police Department Hayward LA Transit Agency New Britain City Hall Oakland Pennington County St. Helena North Korea

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