Clustered 11 filings across 11 jurisdictions · filing window Aug 7, 2025 → Aug 12, 2025. View entity profile → Other incidents for this victim →
incident inc_e53334f410314f2c · merge_method deterministic · confidence 100%
Discovered → first regulatory filing
Range of discovered_at dates across filings
CA DE IA IN ME MT NH OR
Time between earliest and latest filing
Not recorded for this incident
Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster.
all State AG
per-filing reported counts
State AGs report only their own residents; bars show per-filing counts.
Earliest sighting first · deep chronology in Litigation Timeline
11 filings across 11 jurisdictions · Aug 7, 2025 – Aug 12, 2025 · 4 milestones
May 16, 2025 → Jun 24, 2025
When the intrusion reportedly occurred, per the linked filings
May 16, 2025
Reported by DELAWARE AG filing
Jun 24, 2025
Reported by SOUTH CAROLINA AG, VERMONT AG, CALIFORNIA AG, NEW HAMPSHIRE AG filings
Jul 8, 2025
Reported by OREGON AG, MAINE AG, WASHINGTON AG filings
About this clustering
DisclosureLens links filings into incidents through layered matchers: deterministic rules (same source document, multistate filings of one breach, tight-window same-victim pairs), a weighted-similarity scorer for cross-source candidates, and an operator review queue for everything uncertain. Each link records its own method and confidence — shown per filing in the timeline below. The system defaults to NOT merging when uncertain, because a false merge (collapsing two unrelated breaches) is more harmful than a false split (showing related filings separately); uncertain pairs route to human review instead of auto-merging. Filing summaries shown in the timeline are AI-generated extracts — verify each against its linked source.
Columbia University reported an external system breach (hacking) that occurred between May 16, 2025, and June 24, 2025. The breach was discovered on July 8, 2025. The incident affected 2,026 Maine residents. In response, Columbia University offered 24 months of complimentary credit monitoring and identity theft protection services through Kroll, LLC.
Affected (this filing): 2,026
Columbia University, a education sector entity reported a other incident to the Washington Attorney General. The organization became aware of the incident on 2025-07-08 and filed notice on 2025-08-07. 54,075 Washington residents were affected. 30 days elapsed between awareness and notification. 53 days to identify the breach. 0 days to contain the breach.
Affected (this filing): 54,075
Columbia University reported a data breach to the Indiana Attorney General. The breach occurred on 2025-05-16 and was reported on 2025-08-07. 4,078 Indiana residents were affected. 868,969 individuals affected in total.
Affected (this filing): 868,969
Columbia University disclosed a cyber incident occurring on or about May 16, 2025, where an unauthorized third party accessed the network and exfiltrated files. The breach affected names, dates of birth, Social Security numbers, and financial/health information. Approximately 2,510 Rhode Island residents were identified as impacted. Columbia reported the incident to law enforcement, engaged external cybersecurity experts, and is offering two years of complimentary credit monitoring and identity restoration services through Kroll.
Affected (this filing): 2,510
Columbia University reported a data breach to the Montana Attorney General. The breach was reported on 2025-08-07. The breach occurred on 06/24/2025. 686 Montana residents were affected.
Affected (this filing): 686
Columbia University disclosed a cyber incident where an unauthorized third party accessed its network on or about May 16, 2025, and exfiltrated files. The breach affected names, dates of birth, Social Security numbers, and academic/financial data. The university reported the incident to law enforcement and offered two years of credit monitoring. Approximately 2,510 Rhode Island residents were identified as impacted.
Affected (this filing): 2,510
Columbia University experienced unauthorized access to its network starting May 16, 2025, discovered on June 24, 2025. An external actor exfiltrated files containing names, SSNs, DOBs, academic history, and some health/financial aid data. Patient records were not affected. The university engaged forensic experts, notified law enforcement, and is offering credit monitoring.
Columbia University notified South Carolina residents of a cyber incident where an unauthorized third party accessed the network on or about May 16, 2025, and exfiltrated files. Data included names, DOBs, SSNs, and academic/financial/health info. No patient records were affected. Columbia reported to law enforcement, engaged external experts, and offers 2 years of credit monitoring via Kroll.
Columbia University reported a data breach to the Oregon Attorney General. The breach was reported on 2025-08-07. The breach occurred during 5/16/2025 - 6/24/2025. The breach was discovered on 7/8/2025. 868,969 individuals were affected. Notice was sent on 8/7/2025.
Affected (this filing): 868,969
Columbia University, a education sector entity reported a data breach to the Iowa Attorney General. The breach was reported on 2025-08-08.
Columbia University notified the NH Attorney General of a cyber incident where an unauthorized third party accessed the network around May 16, 2025, and exfiltrated personal data including names, DOBs, and SSNs. The breach was detected on June 24, 2025. 2,340 New Hampshire residents were notified on August 7, 2025, and offered 24 months of credit monitoring.
Affected (this filing): 2,340