HackingEducationEducationCapture Stored DataData ExfiltratedCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDHealth (basic)Financial accountEducationHighContained

Columbia University

bd_0c96ffec9a2ab117 · schema v1 · pii pii-v1

Severity

High

Discovered

Jun 24, 2025

Filed

May 7, 2026

To disclose

45 weeks

Affected

11,111state residents only

Linked

2 filings

Confidence

64%

Full breach record for Columbia University →7 incidents on file

Columbia University notified the NH Attorney General that an unauthorized third party gained access to its network on or about May 16, 2025, and exfiltrated files. The incident was discovered on June 24, 2025, following a technical outage. Affected data includes names, dates of birth, Social Security numbers, contact details, demographic information, academic history, financial aid information, and health information. 11,111 New Hampshire residents were affected. The university engaged external cybersecurity experts, reported to law enforcement, implemented security safeguards, and offered two years of credit monitoring and identity restoration services through Kroll.

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Incident timeline

undetected · 39 days

discovery → filing · 45 weeks / 317 days

May 16, 2025

Begins

Jun 24, 2025

Discovered

May 7, 2026

Filed

vs. sector median

+37 wks slower

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Texas State AGbd_a0e855fe568fe7c62026-05-20 · +13dVerified

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: 11,111state-resident count only
Data types: Identity (basic)Government IDHealth (basic)Financial accountEducation
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Notified the Office of the Attorney General, Consumer Protection Bureau

During the incident: Activated our response process
Launched an investigation with the support of external cybersecurity experts
Reported the incident to law enforcement
Implemented a number of safeguards across our systems to enhance our security
Offering two years of complimentary credit monitoring and identity restoration services through Kroll
Established a dedicated call center to answer questions about this incident
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: 45 weeks(317 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

New Hampshire State AGMay 7 · first · this page

Texas State AG+13d

Pattern: first filing May 7 (NH), last May 20 (TX) — a 13-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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-20260507.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 7, 2026
Raw hash: 4db78fcb5c05dcf34ef1b25485c103dcc25372bbf6020c0a406d6044f64ad2f9

Linked disclosures

Regulatory filings (1) · 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