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21/08/2026 4:43 pm
TL;DR: Legacy SASE is failing in five ways because network enforcement cannot see browser-level intent, unmanaged devices, or shadow AI interactions, according to Island. The practical issue is not proxy tuning but shifting controls to the endpoint and browser, where modern work now happens.
NHIMG editorial — based on content published by Island: Five ways your current SASE is failing you right now
By the numbers:
- Island routinely finds secure web gateway deployments are blind to 60 to 70 percent of all traffic when they cannot decrypt it.
Questions worth separating out
Q: How should security teams govern browser-based policy enforcement for identity and data risk?
A: Start by classifying which decisions belong at session time rather than at login, then assign ownership across identity, endpoint, data, and SOC teams.
Q: Why do unmanaged devices complicate zero trust access decisions?
A: Because zero trust depends on continuous verification, and unmanaged devices weaken the confidence you can place in the session context.
Q: What do security teams get wrong about Shadow AI?
A: They often treat Shadow AI as an approval problem for software, when it is usually also an identity problem.
Practitioner guidance
- Map enforcement to browser actions Identify where users upload, paste, approve, and submit data inside browser sessions, then decide which of those events require inline policy enforcement before traffic leaves the endpoint.
- Test unmanaged-device access paths Review how contractors and BYOD users reach SaaS, private apps, and AI tools without relying on a permanently installed endpoint agent or fragile exceptions.
- Separate transport visibility from intent visibility Document which controls only inspect packets and which can see the selected file, browser context, or user action, then close the gap for high-risk workflows.
What's in the full article
Island's full article covers the operational detail this post intentionally leaves for the source:
- How the browser-side policy model maps to SaaS, private apps, and desktop traffic in practice
- The article's explanation of SSL inspection failure modes across TLS 1.3, QUIC, and SSL pinning
- Specific examples of how unmanaged devices and BYOD change enforcement decisions
- A fuller walkthrough of how shadow AI is handled at the point of interaction
👉 Read Island's analysis of why legacy SASE is failing in the browser era →
Legacy SASE in the browser era: where control is breaking down?
Explore further
21/08/2026 5:03 pm
Browser enforcement is becoming a governance boundary, not just a deployment preference. When the work surface moves into the browser, the old assumption that network controls can see enough of the transaction stops holding. That shifts the centre of gravity from perimeter inspection toward interaction-aware policy. For identity and access teams, this means conditional access, device trust, and data controls must be evaluated against the browser session itself, not just the network path. The practitioner conclusion is clear: governance that ignores the browser will keep missing the real control point.
A question worth separating out:
Q: Who is accountable when browser controls fail to prevent data exposure?
A: Accountability sits with the teams that own identity, endpoint, browser policy, and data protection together, not with the sandbox alone. In practice, browser governance spans security architecture, compliance, and access teams because the browser now mediates regulated access and data movement.
👉 Read our full editorial: Browser-enforced policy exposes why legacy SASE is failing
