2026 Klark.ai — 0xSec claim; ~500k people / 140GB support chats + API secrets (unverified)
Data compromised
Actor-claimed: names, emails, phones, password hashes, support conversations, logs, API keys/secrets, some IBANs across four DBs (unverified)
Technical writeup
Unverified leak claim: on August 24, 2026 Cyberattaque.org reported actor 0xSec claiming >140GB from four Klark.ai databases (162 CSV files), estimating ~500,000 people in support-agent and end-customer chat/account data, plus API secrets. Named French retailers appear as conversation volume on the SaaS platform — not confirmed as separately breached. Klark.ai had not confirmed at indexing. recordsAffected 500000; companyConfirmed false.
Root cause
Unverified 0xSec leak claim against Klark.ai customer-support AI platform (Aug 24, 2026)