Zapier fixes bug chain that researchers say risked widespread account takeover

Security researchers discovered a complex five-step vulnerability chain in Zapier that could have enabled attackers to impersonate any signed-in user and access millions of accounts using just a free account. The vulnerabilities spanned multiple areas including code execution, credential recovery, and browser-side code injection, demonstrating how seemingly minor flaws can be chained together for devastating impact. While Zapier responded quickly with patches and no exploitation was found, this incident highlights the critical importance of comprehensive vulnerability testing and the potential for supply-chain attacks through automation platforms. The complexity of modern web applications creates opportunities for sophisticated attack chains that may not be apparent when examining individual components in isolation.