AccidentalTechnologyInformationMisdeliveryEmployee Data InvolvedIdentity (basic)Government IDMediumContained

Glasshouse Media

bd_c4bbd541dcab57ef · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 11, 2026

Filed

Mar 23, 2026

To disclose

12 days

Affected

Not disclosed

Confidence

65%

Full breach record for Glasshouse Media →

Glasshouse Media notified individuals that an internal file containing employee names and Social Security numbers was inadvertently sent to a recipient on March 11, 2026. The company confirmed the file was deleted by the recipient and not further distributed. Complimentary 24-month identity monitoring via Experian is being offered.

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Massachusetts clock✓ MA AG ≤30d12 days discovery → filing

Incident timeline

discovery → filing · 12 days

Mar 11, 2026

Discovered

Mar 23, 2026

Filed

vs. sector median

17 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Glasshouse Media
norm: glasshouse media
Domain: glasshousemedia.com

Name: Glasshouse Media
norm: glasshouse media
Domain: glasshousemedia.com
Industry: Technologyllm

Discovered: Mar 11, 2026
Materiality determined: —
Notification sent: Mar 23, 2026
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Unknown

During the incident: Confirmed with the recipient that the file was deleted and not further distributed
Offering complimentary access to Experian IdentityWorks for 24 months
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 12 days(12 days from discovery to filing)
Compliance flags: MA AG ≤30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

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://www.mass.gov/doc/2026-442-glasshouse-media/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 23, 2026
Raw hash: 234f3945624b896a3ad519de4c8e838a36f14ae1b090a006502c9b8d45e44b3a

Reporting entityGlasshouse Media

Victim entityGlasshouse Media

Incidentdiscovered Mar 11, 2026

Stated responseConfirmed with the recipient that the file was deleted and not further distributed

ComplianceMA AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov