Cal.com has patched a critical authentication bypass (CVE-2025-66489) that allowed attackers to submit any non-empty TOTP field and skip password checks. Versions ≤5.9.7 were impacted.
Update to 5.9.8 to ensure both password and TOTP verification are enforced.
How should MFA implementations be validated to prevent logic gaps like this?
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#infosec #appsec #CVE2025 #authentication #MFA #ThreatIntel #SecureCoding #SoftwareSecurity #VulnerabilityManagement #SecurityUpdate


















