How should security teams reduce the risk of phishing links in email attacks?

Combine email filtering with identity controls that limit damage after a click. The most effective approach includes strong MFA, conditional access, fast message reporting, suspicious login detection, and automated token revocation. If a phishing link gets through, the programme should still prevent easy reuse of the compromised identity.

Why This Matters for Security Teams

Phishing links are not just a mailbox problem. They are an identity and session-risk problem because the click often happens before any human can verify the destination, and the attacker’s goal is usually to capture tokens, MFA prompts, or re-authentication flows rather than simply deliver malware. NHI Management Group sees the same pattern across breach analysis: 52 NHI Breaches Analysis shows how credential misuse frequently turns a single exposure into wider access.

That is why email filtering alone is not enough. A blocked message reduces noise, but it does not prevent a successful login on a separate device, a stolen browser session, or lateral movement after initial compromise. Security teams need to assume that some links will be clicked and make the resulting identity less reusable. Current guidance from the NIST Cybersecurity Framework 2.0 still points toward layered detection and response, but the operational emphasis is shifting toward rapid containment of accounts and sessions after the first suspicious action. In practice, many security teams encounter the real failure only after a phish has already been used to bypass MFA or reuse a stolen token, rather than through intentional test-and-learn exercises.

How It Works in Practice

The most effective programme combines preventive filtering with post-click identity controls. The email gateway should reduce commodity lures, but the stronger protection comes from limiting what a phished user can do with the captured identity. That means phishing-resistant MFA where possible, conditional access that evaluates device health and location, and session controls that can invalidate access quickly when suspicious behaviour appears. CISA threat guidance supports this layered response model, especially when attackers use trusted cloud services and login portals to blend in after the click through CISA cyber threat advisories.

Operationally, teams should focus on four actions:

• Block known malicious links and detonation-test suspicious URLs before delivery.
• Use MFA that resists replay, not just approval-based prompts that can be fat-fingered or fatigued.
• Trigger suspicious-login detection on impossible travel, new device use, token anomalies, or unusual inbox rules.
• Automate token revocation and password reset workflows when a user reports a phish or the SIEM detects abuse.

NHIMG research on the Ultimate Guide to NHIs — Key Challenges and Risks reinforces a practical lesson: attackers often reuse whatever credential or session artifact survives the first alert. One useful benchmark from DeepSeek breach coverage is that when AWS credentials are exposed publicly, attackers attempt access within an average of 17 minutes, and as quickly as 9 minutes in some cases; the same urgency applies to phished sessions. These controls tend to break down in environments with legacy IMAP/POP access, long-lived browser sessions, or weak identity telemetry because revocation cannot keep pace with reuse.

Common Variations and Edge Cases

Tighter identity controls often increase user friction and helpdesk load, requiring organisations to balance fast containment against login convenience. That tradeoff is real, especially for executives, remote workers, and third-party users who rely on older devices or inconsistent network conditions. Best practice is evolving, but there is no universal standard for this yet: some teams prioritise phishing-resistant MFA everywhere, while others phase it in for high-risk groups first.

Edge cases matter. If attackers target mobile devices, link protection may be less effective because the browser and authenticator live on the same endpoint. If the phish leads to OAuth consent rather than a password prompt, conditional access alone may not stop token grant abuse. If the organisation uses shared mailboxes or delegated access, incident response must revoke both the user session and any downstream mailbox permissions. The broader NHI lesson from The State of Non-Human Identity Security is that weak visibility and poor rotation make compromise harder to contain once an identity is abused. The same logic applies to human phishing defense: if the response cannot invalidate what was stolen, the attack keeps working after the click.

Related resources from NHI Mgmt Group

• How should security teams reduce business email compromise risk beyond secure email gateways?
• How should security teams handle email compromise as an identity risk?
• How do teams know whether email security is actually reducing risk?
• How should security teams reduce executive impersonation risk?