[OR] [BB] [E3] [CBS] [1] [ITo] Establish Impact Tolerances

Written by Moh Heng Goh | Mar 6, 2026 7:22:04 AM

CBS-1 Digital Account Access & Management

Introduction

Operational resilience requires financial institutions such as Boost Bank to identify their Critical Business Services (CBS) and define clear impact tolerances — the maximum tolerable level of disruption to important services before causing intolerable harm to customers, market integrity, or regulatory compliance.

In line with regulatory expectations on operational resilience, impact tolerance for CBS-1 Digital Account Access & Management is defined in terms of:

Maximum Tolerable Downtime (MTD) – the longest acceptable service disruption
Maximum Tolerable Data Loss (MTDL) – the maximum acceptable data loss measured in time (Recovery Point Objective)
Customer Impact – financial, reputational, or service-access consequences
Regulatory Impact – breach of legal, compliance, or supervisory obligations
Impact Type – financial, operational, reputational, regulatory, or systemic

CBS-1 is foundational to Boost Bank’s digital operating model. It underpins customer onboarding, secure access, profile management, fraud monitoring, and overall digital engagement. Any prolonged disruption would significantly affect customer trust, financial safety, and regulatory compliance.

The table below summarises the proposed impact tolerances for each Sub-CBS under CBS-1.

Table P4: Establish Impact Tolerance for CBS-1

Sub-CBS Code	Sub-CBS	Maximum Tolerable Downtime (MTD)	Maximum Tolerable Data Loss (MTDL)	Customer Impact	Regulatory Impact	Impact Type	Current Resilience Status	Action Required
1.1	Account Onboarding & Registration	4 hours	≤ 15 minutes	New customers unable to open accounts; onboarding delays	Breach of digital banking service commitments	Operational / Reputational	Partially Resilient	Strengthen onboarding system redundancy & third-party KYC failover
1.2	Authentication & Access Control	1 hour	Near zero (< 5 minutes)	Customers unable to log in; loss of trust	High – risk of non-compliance with access security regulations	Operational / Regulatory / Security	Moderate	Implement multi-region authentication redundancy & enhanced IAM monitoring
1.3	Profile & Account Maintenance	8 hours	≤ 30 minutes	Customers unable to update details; service inconvenience	Moderate – data integrity obligations	Operational	Acceptable	Improve database replication & change validation controls
1.4	Embedded Banking Integration	6 hours	≤ 30 minutes	Disruption to partner ecosystem integrations	Potential breach of partnership SLAs	Operational / Reputational	Developing	Enhance API gateway failover & third-party resilience testing
1.5	Security & Fraud Monitoring	30 minutes	Zero data loss	Increased fraud exposure; financial loss risk	Severe – AML/CFT & fraud monitoring obligations	Regulatory / Financial / Reputational	Needs Strengthening	Deploy real-time monitoring redundancy & automated escalation workflows
1.6	Password & PIN Reset / Recovery	2 hours	≤ 5 minutes	Customers locked out of accounts	Moderate – customer protection obligations	Operational / Reputational	Moderate	Introduce automated failover for self-service recovery systems
1.7	Device & Session Management	2 hours	≤ 5 minutes	Session failures; potential security exposure	High – cyber risk exposure	Security / Regulatory	Moderate	Strengthen session token replication & real-time anomaly detection
1.8	Alerts & Notification Services	4 hours	≤ 15 minutes	Customers not informed of transactions; anxiety & reduced trust	High – transaction notification requirements	Operational / Regulatory	Needs Improvement	Implement multi-channel notification redundancy (SMS, push, email)
1.9	Regulatory Compliance & Logging	1 hour	Zero data loss	No immediate visible impact to customers	Severe – inability to evidence compliance	Regulatory	Needs Strengthening	Ensure immutable logging, offsite replication & SIEM failover
1.10	Service Availability & Continuity Management	30 minutes (for full outage)	≤ 5 minutes	Widespread service unavailability	Severe – systemic & supervisory impact	Systemic / Regulatory / Operational	Developing	Conduct regular scenario testing & strengthen active-active infrastructure

Key Observations

Most time-critical functions: Security & Fraud Monitoring (1.5) and Service Availability (1.10)
Zero data loss tolerance areas: Fraud Monitoring and Regulatory Logging
Highest regulatory exposure: Authentication, Fraud Monitoring, Compliance Logging
Highest customer trust risk: Authentication failure, login issues, and missing alerts

Establishing impact tolerances for CBS-1 Digital Account Access & Management enables Boost Bank to clearly define the threshold at which disruption becomes intolerable from a customer, regulatory, and systemic perspective.

The analysis shows that:

Security, authentication, and fraud monitoring functions carry the lowest downtime tolerance and require near-zero data loss.
Customer-facing digital access services require strong availability, redundancy, and real-time recovery capabilities.
Regulatory logging and compliance functions must maintain continuous integrity and auditability, even during disruption.
Third-party integrations and embedded banking channels introduce concentration and dependency risks that must be actively managed.

By defining measurable impact tolerances, Boost Bank can:

Prioritise investment in resilience capabilities.
Conduct scenario testing against defined thresholds.
Strengthen third-party oversight.
Align recovery strategies (RTO/RPO) with regulatory expectations.
Enhance board-level oversight of operational resilience.

Ultimately, clear impact tolerances transform operational resilience from a compliance exercise into a structured risk management discipline — ensuring that even during severe but plausible disruptions, Boost Bank continues to protect customers, maintain trust, and meet regulatory obligations.

Digital Banking Resilience: Strengthening Boost Bank for Tomorrow
eBook 3: Starting Your OR Implementation
CBS-1 Digital Account Access & Management
CBS-1 DP	CBS-1 MD	CBS-1 MPR	CBS-1 ITo	CBS-1 SuPS	CBS-1 ST

For organisations looking to accelerate their journey, BCM Institute’s training and certification programs, including the OR-5000 Operational Resilience Expert Implementer course, provide in-depth insights and practical toolkits for effectively embedding this model.

More Information About OR-5000 [OR-5] or OR-300 [OR-3]

To learn more about the course and schedule, click the buttons below for the OR-300 Operational Resilience Implementer course and the OR-5000 Operational Resilience Expert Implementer course.



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