In regulated environments, organisations should map MFA choices to the expectations of local cybersecurity standards, identity trust guidance, and data protection rules. For the UAE context, the practical question is whether the control is strong enough for high-assurance use cases such as finance, government, healthcare, and privileged access, where SMS OTPs are increasingly difficult to justify.
Why This Matters for Security Teams
The short answer is that SMS OTPs are often too weak for sensitive access because they rely on a channel that is vulnerable to SIM swap, interception, and social engineering. For high-assurance environments, teams should map authentication choices to the strength expected by the business impact, not to convenience. That is especially important for privileged access, regulated data, and administrative workflows where compromise can cascade quickly.
Current guidance from the NIST SP 800-53 Rev 5 Security and Privacy Controls and the NIST Cybersecurity Framework 2.0 points organisations toward stronger, risk-based authentication for higher-impact access. In NHI Management Group research, the issue is amplified by weak identity hygiene: Ultimate Guide to NHIs reports that 97% of NHIs carry excessive privileges and only 5.7% of organisations have full visibility into service accounts. In practice, many security teams discover that SMS OTP was never meant to protect the access paths attackers actually target, only after an account takeover or privileged misuse has already occurred.
How It Works in Practice
For sensitive access, the decision is usually less about a single factor and more about whether the authentication method can resist realistic attack paths. Stronger options typically include phishing-resistant MFA such as hardware security keys, certificate-based authentication, or app-based methods bound to device and context. The practical benchmark is whether the factor can survive SIM abuse, replay, credential theft, and helpdesk-driven bypass.
Teams should align each access path to risk level. Administrative consoles, payment systems, health records, and cloud control planes generally deserve stronger controls than routine user sign-in. The OWASP Non-Human Identity Top 10 is useful here because it reinforces a broader lesson: identity controls fail when the credential itself becomes the attack surface. NHIs are often the hidden counterpart to this problem, and Ultimate Guide to NHIs — Regulatory and Audit Perspectives helps frame why auditability, rotation, and revocation matter for both human and machine access.
- Use SMS OTP only where the access risk is genuinely low and local policy permits it.
- Prefer phishing-resistant MFA for privileged, financial, and regulated workflows.
- Bind authentication to device trust, session context, or certificate possession where possible.
- Require step-up authentication for unusual location, device, or privilege changes.
- Document exceptions and re-evaluate them against current threat models.
Where authentication is tied to non-human workflows, the stronger pattern is to combine workload identity, short-lived secrets, and policy-based access rather than reuse human-style OTP flows. These controls tend to break down in heavily outsourced or legacy helpdesk environments because recovery processes often become the easiest bypass route.
Common Variations and Edge Cases
Tighter authentication often increases user friction and support overhead, requiring organisations to balance assurance against operational continuity. That tradeoff is real, especially where legacy systems, field operations, or customer-facing services cannot immediately adopt phishing-resistant MFA everywhere.
There is no universal standard for this yet, but current guidance suggests treating SMS OTP as unsuitable for the most sensitive access paths and as a transitional control at best. In some jurisdictions or sectors, policy may explicitly prefer stronger methods for privileged users, while others allow SMS only when risk is low and compensating controls are strong. The safest interpretation is that if the access can materially affect finance, government services, healthcare data, or cloud administration, SMS OTP should not be the default.
For NHI-heavy environments, the issue is even sharper because service accounts and API keys do not benefit from OTP at all. Instead, teams should use the identity and lifecycle discipline described in Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs and validate whether their control stack supports revocation, rotation, and full traceability. A practical rule is simple: if a compromised factor would let an attacker pivot into admin actions or sensitive records, SMS OTP is too weak for that path.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0, NIST SP 800-63, NIST SP 800-53 Rev 5 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC-7 | Focuses on authentication methods appropriate to the risk of access. |
| NIST SP 800-63 | AAL2 | Defines assurance levels that exceed SMS OTP for sensitive use cases. |
| NIST SP 800-53 Rev 5 | IA-2 | Covers identification and authentication for access to systems and applications. |
| OWASP Non-Human Identity Top 10 | NHI-03 | Credential strength and rotation matter for non-human access paths too. |
| NIST AI RMF | Risk governance should determine when stronger authentication is required. |
Use stronger authentication for high-risk access and reserve SMS OTP for lower-risk cases only.
