HackingCustomer Data InvolvedPIIIDENTITY_BASICMediumContained
Mastery Charter High School
bd_d445c07723535b6b · schema v1 · pii pii-v1
Full breach record for Mastery Charter High School →Mastery Charter High School, an education entity based in Philadelphia, PA, reported an external system breach (hacking) occurring between September 14 and 16, 2025. The incident affected a total of 37,031 individuals, including 4 Maine residents. The breach was discovered on September 15, 2024. The entity provided written notification to affected individuals on June 6, 2025, and offered 12 months of Experian IdentityWorks identity monitoring and restoration services.
Maine clockDiscovered Sep 15, 2024 → Filed with AG Jun 6, 2025264d ✗ ME AG >90d38 weeks discovery → filing
⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.
This filing is one of 4 about the same incident.View merged incident
Linked disclosures
Why this link?Regulatory filings (3) · sorted by filing gap
- bd_557cf3225408f29aIndiana State AGfiled 2025-06-06Verified
- bd_ac760a429f740ea3Vermont State AGfiled 2025-06-06Verified
- bd_e77dfb9a7798647dNew Hampshire State AGfiled 2025-06-12(6d gap)Verified
Source provenance
- Source URL
- https://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/1a2f7e23-e6a7-448f-b7a4-f2a875c0da1b.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
- Filed at
- Jun 6, 2025
- Raw hash
- 4c5b86d9affa18f871ccfa80e71689b0f573bafecbb968b0643e404b20e40b2e
Reporting entity
- Name
- Mastery Charter High Schoolnorm: mastery charter high school
- Industry
- education
Victim entity
- Name
- Mastery Charter High Schoolnorm: mastery charter high school
- Industry
- education
Incident
- Discovered
- Sep 15, 2024
- Materiality determined
- —
- Notification sent
- Jun 6, 2025
- Affected individuals
- 37,031
- Data types
- PIIIDENTITY_BASIC
- Attack vector
- Unauthorized Access
- MITRE ATT&CK
- T1190 Exploit Public-Facing Application
- Threat actor
- External
- Regulator citations
- Filed data breach notice with Maine Attorney General
- Initial access
- exploit_public_facing
Compliance
- Time to disclose
- 38 weeks(264 days from discovery to filing)
- Compliance flags
- ME AG >90d · 264dME resident >180d · 264d
- Discovery-date grounding
- unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.
- Clock breakdown
Statute Window Elapsed Threshold Status Maine Discovered: Sep 15, 2024→ Filed with AG: Jun 6, 2025264d 90 days ME AG >90d Maine Discovered: Sep 15, 2024→ Notified: Jun 6, 2025264d 180 days ME resident >180d
Extraction provenance
- Status
- No extraction artifact recorded for this disclosure.