MisuseOtherPrivilege AbuseEmployee Data InvolvedGovernment IDIdentity (basic)MediumContained

Sierra Club

bd_0817cb1dfc1ba95f · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 9, 2023

Filed

Oct 5, 2023

To disclose

21 weeks

Affected · nationwide

81310 in this filing

Linked

6 filings

Confidence

66%

Full breach record for Sierra Club →

Sierra Club reported a data breach occurring on 02/09/2023, discovered on 05/09/2023, involving insider wrongdoing. The incident affected 813 individuals, including 10 Maine residents. Social Security Numbers were compromised. The organization provided written notification on 10/04/2023 and offered 12 months of credit monitoring through Experian.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered May 9, 2023 → Filed with AG Oct 5, 2023149d ✗ ME AG >90d21 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 89 days

discovery → filing · 21 weeks / 149 days

Feb 9, 2023

Begins

May 9, 2023

Discovered

Oct 5, 2023

Filed

vs. sector median

+13 wks slower

This filing is one of 6 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

Vermont State AGbd_2424595bc8ca2c332023-10-05Verified
New Hampshire State AGbd_6210b1910769410b2023-10-05Verified
Massachusetts State AGbd_a5fa06c873e923342023-10-05Verified
Montana State AGbd_dfe987f053485cfe2023-10-05Verified

Show 1 more filing ↓up to 1d gap

Indiana State AGbd_cf1225f15684e8b82023-10-04 · +1dVerified

Name: Sierra Club
norm: sierra club

Name: Sierra Club
norm: sierra club
Industry: Otherllm

Discovered: May 9, 2023
Breach occurred: Feb 9, 2023
Undetected for: 89 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 4, 2023
Affected individuals: 813state + nationwide
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Insider
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: Internal
Regulator citations: Filed data breach notice with Maine Attorney General
Initial access: insider_action

During the incident: Sent written notification to affected individuals
Offered 12 months of Experian Identityworks credit monitoring and identity restoration services
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 21 weeks(149 days from discovery to filing)
Compliance flags: ME AG >90d · 149dME resident >60d · 148d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: May 9, 2023
→ Filed with AG: Oct 5, 2023
149d 90 days ME AG >90d
Maine
Discovered: May 9, 2023
→ Notified: Oct 4, 2023
148d 60 days (analyst band; statutory cap is 30 days) ME resident >60d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: May 9, 2023 → Filed with AG: Oct 5, 2023	149d	90 days	ME AG >90d
Maine	Discovered: May 9, 2023 → Notified: Oct 4, 2023	148d	60 days (analyst band; statutory cap is 30 days)	ME resident >60d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 6 states

View merged incident ↗

Indiana State AGOct 4 · first

Vermont State AG+1d

New Hampshire State AG+1d

Massachusetts State AG+1d

Montana State AG+1d

Maine State AG+1d · this page

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.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/1006fd14-1097-4703-8f62-5ce6e7086838.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 5, 2023
Raw hash: 9383d99fe28615777c677f5d66fbe2148653e115a01303e0a13660e2e3d671f8

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entitySierra Club

Victim entitySierra Club

Incidentdiscovered May 9, 2023

Stated responseSent written notification to affected individuals

ComplianceME AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov