Data Breach Disclosed: Questel — 1,226,209 Accounts Exposed

ANALYST: BIVASH KUMAR NAYAK (CHIEF SECURITY ARCHITECT) • PUBLISHED: Wednesday, 2 September 2026
Data Breach Disclosed: Questel — 1,226,209 Accounts Exposed
■ Executive Risk Command Center
CISA KEV
Unknown
Unknown or unavailable; no negative claim is made

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📅 September 02, 2026  |  📂 Data Breach  |  🛡 CYBERDUDEBIVASH®
PUBLIC BREACH RECORD · UNRATED
CDB-CTI-2026-F8496C6F1F06 · Generated 2026-09-02T04:38:56.067905Z
Executive Summary

Questel (questel.com) has been added to the public breach disclosure record, exposing 1,226,209 accounts. Compromised data includes: Email addresses, Employers, Job titles, Names, Phone numbers, Physical addresses.

Decision: Validate relevance and exposure using the cited source and internal evidence before treating this record as an incident, confirmed compromise, or customer-specific finding.

Threat Classification and Evidence Status
Intelligence family
Public Breach Record
Technical severity
UNRATED
Exploitation
Not applicable to this intelligence format
Patch/remediation
Not applicable to this intelligence format
Verified Facts
Source type: Public Breach Record
Source publication time: 2026-09-01T04:49:35+00:00
KEV catalog check: Unknown or unavailable; no negative claim is made.
Disclosure Assessment

Evidence boundary: The source is a public breach-record entry. It does not establish that the reader or their environment is affected.

Defensive Decision Guidance
Identity: Search for corporate identities associated with the disclosed service using an approved exposure-monitoring process; never upload passwords or secrets.
Access control: Revoke exposed sessions, require unique credentials, and enforce phishing-resistant MFA where affected accounts are confirmed.
Privacy: Route confirmed organizational exposure through legal/privacy assessment before notification decisions.
Source Evidence Extract
Breach Name: Questel
Domain: questel[.]com
Accounts Exposed: 1,226,209
Compromised Data: Email addresses, Employers, Job titles, Names, Phone numbers, Physical addresses

This extract is escaped and rendered from the ingested source record; generated analysis is not presented as a source fact.

Detection Engineering
DETECTION STATUS: NOT_APPLICABLE

The source is an intelligence/news record without threat-specific telemetry or observables.

Track the cited development through the relevant risk, governance, or incident-management process.
Create detection content only after a concrete attack behavior, log source, and testable observable are confirmed.
References
AI-Native Automated Intelligence — Evidence-Graph Verified. Public reference draft — not a certified customer deliverable. Customer-specific action requires exposure validation and accountable human approval.
Role-Based Decisions
Legal / Compliance / Privacy: Assess whether this public breach record involves the organization's own data, customers, or vendors before any notification or regulatory determination. — A public breach record is a disclosure to review, not a confirmed organizational incident on its own (c-summary only -- no scope evidence has been independently established).
Limitations: Based on a public disclosure record only; does not confirm organizational, customer, or vendor data involvement, and is not itself a regulatory or legal determination.
Source Reliability & Corroboration

breach_intel

Source Reliability: C
Information Credibility: 3 (Possibly True)
Overall Analytical Confidence: MEDIUM

Reported by a single identified source; an independent second source has not been found (see the evidence ledger).

Intelligence Gaps
Known Unknown: Whether an independent second source corroborates this record has not been assessed.
Would be resolved by: A second, independent source reporting the same underlying fact.
Known Unknown: The actual scope of data exposure (records, individuals, or data categories affected) has not been independently confirmed beyond the public disclosure record.
Would be resolved by: A verified breach notification or regulatory filing detailing confirmed scope.
Indicators / Observables
Domain: questel[.]com
Indicators are defanged for safe display (e.g. hxxp:// / [.]) -- refang before use in blocking or detection tooling.

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Contact: bivash@cyberdudebivash.com · Website: https://cyberdudebivash.com
Intelligence source: https://haveibeenpwned.com/PwnedWebsites#Questel · CYBERDUDEBIVASH® SENTINEL APEX Evidence Engine v3.0
Provenance and Certification
Report IDCDB-CTI-2026-F8496C6F1F06
Source systembreach_intel
Source published2026-09-01T04:49:35+00:00
Source-record SHA-256f8496c6f1f0606adf374ff5e11cc4635da18adcf1004eca927da94c15317bc3a
Generated UTC2026-09-02T04:38:56.078553Z
Production ModeAI-Native Automated Intelligence — Evidence-Graph Verified
CertificationPublic Intelligence Certification: FLASH_READY (automated evidence-graph certification — see Provenance for the source basis)