--- source_url: "https://secfense.com/solutions/legacy-applications" title: Modernize Legacy Application Security - Secfense mirrored_at: 2026-08-05T01:00:59.090Z host: secfense.com cited_in_42a: true mirror_canonical: "https://index.42a.ai/secfense.com/solutions/legacy-applications" --- > **Original source:** https://secfense.com/solutions/legacy-applications NEW New Use Cases Platform Resources Why Secfense Company / Legacy Applications / ## Modern Authentication for Outdated Systems ## Modern Authentication for Outdated Systems ## Add phishing-resistant passkeys and strong MFA to legacy 

apps without rewriting code or replacing your existing stack. ## Add phishing-resistant passkeys and strong MFA to legacy 

apps without rewriting code or replacing your existing stack. ![](https://framerusercontent.com/images/UEbPFqz3pTc2S6ZNqKJXWQhL62k.png?width=966&height=819) ## Why Modernize Legacy Application Security with Secfense Add strong authentication without code changes Deploy passwordless login or multi-factor authentication into legacy applications, even if they lack SAML or OIDC support. Add strong authentication without code changes Deploy passwordless login or multi-factor authentication into legacy applications, even if they lack SAML or OIDC support. Protect against phishing and credential theft FIDO2/WebAuthn passkeys eliminate are bound to domain, stopping phishing attacks at the source. Protect against phishing and credential theft FIDO2/WebAuthn passkeys eliminate are bound to domain, stopping phishing attacks at the source. No-code, agentless deployment Works as a reverse proxy, no changes to application source code or installation on endpoints. No-code, agentless deployment Works as a reverse proxy, no changes to application source code or installation on endpoints. Maintain existing logins during migration Hybrid setup allows gradual rollout without disrupting operations. Maintain existing logins during migration Hybrid setup allows gradual rollout without disrupting operations. ## Built for Complex, Legacy Environments ## Built for Complex, Legacy Environments Whether you’re securing a mainframe portal, on-prem ERP, or a custom-built business tool, Secfense enables: Whether you’re securing a mainframe portal, on-prem ERP, or a custom-built business tool, Secfense enables: Secure login with passkeys Compatibility with any IdP (SAML, OIDC, or proprietary) Flexible fallback options such as TOTP, SMS, or email. No disruption to front-end or back-end systems ## Case Study: Modern Authentication in Financial Services ## Case Study: Modern Authentication in Financial Services A major financial institution implemented passwordless login for its business clients on the corporate banking platform: A major financial institution implemented passwordless login for its business clients on the corporate banking platform: **No code changes to application or identity provider** **No code changes to application or identity provider** **Passkey interface added to existing infrastructure** **Passkey interface added to existing infrastructure** **Secure session handling integrated with current authentication** **Secure session handling integrated with current authentication** **Gradual rollout with selected user groups** **Gradual rollout with selected user groups** The result: a modern, compliant, and disruption-free login experience for clients. ### The result: a modern, compliant, and disruption-free login experience for clients. ![](https://framerusercontent.com/images/wBOGq1CTJT2eTLiezzUzalDRI0.png?width=1344&height=1008) ### How It Works How It Works ### How It Works Detects the legacy login flow in real time Detects the legacy login flow in real time Injects passkey or MFA UI dynamically Injects passkey or MFA UI dynamically Validates authentication via Secfense server (FIDO2, certificates, or hardware keys) Validates authentication via Secfense server (FIDO2, certificates, or hardware keys) Hands off authenticated sessions to your existing IdP or session manager Hands off authenticated sessions to your existing IdP or session manager Agentless, invisible to end users, and compatible with even the most outdated systems. Agentless, invisible to end users, and compatible with even the most outdated systems. ### Security & Compliance

by Design ### Security & Compliance

by Design Secfense authentication flows meet modern standards 

and regulations: NIS2, DORA, PSD2 SCA, GDPR Multi-factor assurance (possession + inherence) Cryptographic binding of sessions Secure on-device key storage ### Security & Compliance

by Design Secfense authentication flows meet modern standards 

and regulations: NIS2, DORA, PSD2 SCA, GDPR Multi-factor assurance (possession + inherence) Cryptographic binding of sessions Secure on-device key storage Security & Compliance

by Design Secfense authentication flows meet modern standards 

and regulations: NIS2, DORA, PSD2 SCA, GDPR Multi-factor assurance (possession + inherence) Cryptographic binding of sessions Secure on-device key storage ## Why IT Leaders Choose Secfense 

for Legacy Systems ## Why IT Leaders Choose Secfense 

for Legacy Systems Secfense acts as an authentication broker deployed via reverse proxy. It detects login flows in real time and dynamically inserts secure authentication options like: Secfense acts as an authentication broker deployed via reverse proxy. It detects login flows in real time and dynamically inserts secure authentication options like: Add phishing-resistant MFA without rewriting apps Add phishing-resistant MFA without rewriting apps Preserve existing infrastructure 

and investments Preserve existing infrastructure 

and investments Reduce password resets 

and lockout support costs Reduce password resets 

and lockout support costs Extend life of business-critical applications securely Extend life of business-critical applications securely ## Secure Legacy Applications Without Disruption ## Secure Legacy Applications Without Disruption ## Secure Legacy Applications Without Disruption