HackingEducationEducationStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancialHealth (basic)HighContained

Columbia University

bd_1de0d58aeabac377 · schema v1 · pii pii-v1

Severity

High

Discovered

Jun 24, 2025

Filed

Aug 12, 2025

To disclose

7 weeks

Affected

2,340state residents only

Linked

15 filings

Confidence

66%

Full breach record for Columbia University →7 incidents on file

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.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 39 days

discovery → filing · 7 weeks / 49 days

May 16, 2025

Begins

Jun 24, 2025

Discovered

Aug 12, 2025

Filed

vs. sector median

2 wks faster

This filing is one of 15 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Iowa State AGbd_2337be0c0546ca352025-08-08 · +4dVerified
Maine State AGbd_07533b0c85ac791c2025-08-07 · +5dCandidate
Massachusetts State AGbd_0e780a9cd65865c92025-08-07 · +5dVerified
Washington State AGbd_2c8504262b9c10eb2025-08-07 · +5dVerified

Show 6 more filings ↓up to 14d gap

Indiana State AGbd_44bbed6c166a9c6d2025-08-07 · +5dVerified
Nebraska State AGbd_4af6126d602d67a62025-08-07 · +5dVerified
Delaware State AGbd_82648491a36c0afc2025-08-07 · +5dVerified
Montana State AGbd_88b5b3d68c5a023a2025-08-07 · +5dVerified
Vermont State AGbd_9b1ee72034df1e552025-08-07 · +5dVerified
Rhode Island State AGbd_d3027779956216f92025-08-26 · +14dVerified

Showing first 10 of 14 linked disclosures.

Name: Columbia University
norm: columbia university

Name: Columbia University
norm: columbia university
Industry: Educationllm

Discovered: Jun 24, 2025
Breach occurred: May 16, 2025
Undetected for: 39 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 7, 2025
Affected individuals: 2,340state-resident count only
Data types: Identity (basic)Government IDFinancialHealth (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Reported the incident to law enforcement
Initial access: valid_credentials

During the incident: Activated our response process
Launched an investigation with the support of external cybersecurity experts
Reported the incident to law enforcement
Established a dedicated call center to answer individuals' questions
Offering 24 months of complimentary credit monitoring and identity theft protection services through Kroll
Changes made: Implemented a number of safeguards across our systems to enhance our security
Examining what additional steps we can take and additional safeguards we can implement to prevent something like this from happening again
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 weeks(49 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 11 states

View merged incident ↗

Maine State AGAug 7 · first

Massachusetts State AGAug 7 · first

Washington State AGAug 7 · first

Indiana State AGAug 7 · first

Nebraska State AGAug 7 · first

Delaware State AGAug 7 · first

Montana State AGAug 7 · first

Vermont State AGAug 7 · first

Iowa State AG+1d

New Hampshire State AG+5d · this page

Rhode Island State AG+19d

Pattern: first filing Aug 7 (ME), last Aug 26 (RI) — a 19-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 14 — the full spread may be wider.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://mm.nh.gov/files/uploads/doj/remote-docs/columbia-university-20250812.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 12, 2025
Raw hash: 9b9dee381d1445fcda95afccb855971d79164f0ae39cea70a589ea24f33c4346

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityColumbia University

Victim entityColumbia University

Incidentdiscovered Jun 24, 2025

Stated responseActivated our response process

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov