negativeSYS.SOURCE: TechCrunch• 2026-08-10T14:14:43Z

Klaviyo Security Flaw Exposed User Sign-Up Data to Advertisers

#security #data breach #vulnerability

A security vulnerability in Klaviyo's sign-up form exposed user credentials and company data to third-party advertisers between February 2024 and November 2025. Klaviyo confirmed the issue was resolved but did not publicly disclose the incident, leaving uncertainty about the full scope of affected users.

A bug in the tech giant's website the logo of US marketing automation company Klaviyo Inc. is seen displayed on a smartphone in front of an abstract background on a computer screen..

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> TESLA RECALLS 2.98 MILLION VEHICLES IN CHINA DUE TO HIDDEN DOOR HANDLE SAFETY CONCERNS > UNEXPECTED IMPLICATIONS OF KPIS IN ORGANIZATIONAL PERFORMANCE METRICS > BEN MCKENZIE CONDEMNS CRYPTOCURRENCY AS LARGEST PONZI SCHEME IN HISTORY > MIGRATING SYNOLOGY NAS TO UNIFI UNAS PRO 8 USING ROBOCOPY AND SMB MULTICHANNEL: PERFORMANCE INSIGHTS > SHODAN: A SEARCH ENGINE FOR INTERNET-CONNECTED DEVICES > DEVELOPMENT OF A LOW-LATENCY AI GAMING COMPANION FOR SKYRIM > REVERSE ENGINEERING PERIPHERALS: FIRMWARE ANALYSIS AND SECURITY EXPLOITS > EFFICIENT PARALLEL DEVELOPMENT WITH GIT WORKTREE TO AVOID CONTEXT SWITCHING > GPT-2 MODEL IMPLEMENTATION USING PURE CMAKE > DECLARATIVE WEBGPU CONFIGURATION USING S-EXPRESSIONS> TESLA RECALLS 2.98 MILLION VEHICLES IN CHINA DUE TO HIDDEN DOOR HANDLE SAFETY CONCERNS > UNEXPECTED IMPLICATIONS OF KPIS IN ORGANIZATIONAL PERFORMANCE METRICS > BEN MCKENZIE CONDEMNS CRYPTOCURRENCY AS LARGEST PONZI SCHEME IN HISTORY > MIGRATING SYNOLOGY NAS TO UNIFI UNAS PRO 8 USING ROBOCOPY AND SMB MULTICHANNEL: PERFORMANCE INSIGHTS > SHODAN: A SEARCH ENGINE FOR INTERNET-CONNECTED DEVICES > DEVELOPMENT OF A LOW-LATENCY AI GAMING COMPANION FOR SKYRIM > REVERSE ENGINEERING PERIPHERALS: FIRMWARE ANALYSIS AND SECURITY EXPLOITS > EFFICIENT PARALLEL DEVELOPMENT WITH GIT WORKTREE TO AVOID CONTEXT SWITCHING > GPT-2 MODEL IMPLEMENTATION USING PURE CMAKE > DECLARATIVE WEBGPU CONFIGURATION USING S-EXPRESSIONS