Employees across organizations are using AI to harness its potential to automate, coordinate, and optimize complex workflows. Some of that happens through tools IT has reviewed and approved. A lot of it happens through personal accounts and browser extensions nobody in security has ever seen, let alone signed off on.
The familiar security playbook to minimize AI risk is to discover the AI tools in use. Gate access with CASB, adding DLP rules to the mix, and tracking their usage. While this is not a bad security model (considering that its worked for years to secure SaaS sprawl) it has its limitations when it comes to AI.
Why CASB and DLP Fall Short for AI
Unlike conventional SaaS risk, which can be confined to an app, a file, or a structured data field, AI risk is a different animal. It rears its head in a prompt. It shows up in the response generated by the AI model. And in a scenario that organizations have come to dread, it comes up in action that autonomous agents take because of a malicious prompt.
Unfortunately, none of these scenarios always cleanly align with what CASB and DLP were built to inspect.
The question that CASB asks is whether a user is allowed to access a particular application, including an AI tool, and, in many cases, it governs what they can do inside. But when it comes to AI, it is also important to consider the meaning behind the conversation. Traditional CASB controls may not evaluate the semantic and cumulative context of an AI conversation with sufficient depth.
This is the gap that must be addressed.
Substance matters in AI. A prompt might look harmless at first glance, but dig deeper, and its wording, context, and purpose can make it risky. With AI, exposure won’t always come from pasting an account number or API key as a part of a conversation. A user might unknowingly share sensitive details across prompts. They can be described indirectly, but it is enough for the model to make sense of them.
Imagine information shared around a vendor contract that is being closed in the next few days, or a summary of an outage incident report; in both cases, there is real business risk associated with this information sharing, even if it does not match a DLP rule.
CASB has similar limitations; the user can access the app. But the risk can appear later with this user’s prompt.
This scenario puts security teams in a bind. Squeeze CASB more tightly, and your users might shift to unmanaged apps that nobody can see. If the DLP is too permissive, you are leaving the gates open for sensitive data leakage.
Security Must Inspect the Interaction
Controls should operate where exposure happens, and in this case, it is happening inside the exchange between a person and the AI model. That means looking closely at what’s being asked, what the model generates in response, what tools the agent invokes, what data it retrieves or transmits, and whether its resulting actions are permitted. As opposed to just deciding whether to allow or block access to the AI service itself.
A few scenarios show why that distinction matters:
- Using AI to come up with a blog outline for publication is a routine task. However, using it to develop go-to-market copy referencing an unannounced product puts sensitive information at risk.
- A software developer using an AI tool to answer a generic question is at low risk. But the same is not true for a request that includes proprietary logic. It can become worse if a question is linked to a real customer problem. Whether this information is shared or generated as output, this doesn’t fall within the purview of safe AI use.
- When it comes to agentic workflows, the agent retrieving the approved knowledge base is not risky, but forwarding restricted internal documentation externally is definitely risky.
- Summarizing an already-public document is low-risk. Reconstructing confidential information from a partial context is not.
- Treating retrieved content as data is expected behavior. But when instructions are embedded cleverly enough that the agent ingests and follows them, prompt injection becomes a serious risk because the model cannot reliably distinguish data from instructions.
- Authenticating an agent or session is a baseline control. But it is not enough when a low-risk request can suddenly turn into a high-risk action, which is why security will need AI anomaly detection to decide what should be allowed.
Extending Governance, Not Blocking Access
A default-deny doesn’t hold up in the long term. Blocking access outright looks safe on paper, but employees still have deadlines, so usage shifts to personal accounts and unmanaged extensions that CASB was never configured to see. This scenario sees the deeper penetration of shadow AI.
Reducing AI risk isn’t a battle between CASB, DLP, and interaction-level inspection. All three are important and solve different layers of the same problem.
Putting your best foot forward for managing AI risk means:
- Treating prompt injection and agent misuse as real, everyday risks now, rather than edge cases to be addressed later.
- Leveraging CASB and DLP to discover SaaS and AI apps in use, govern access, detect known sensitive patterns, and support compliance reporting.
- Adding an interaction layer that drills down into the semantics of a prompt, the sensitive nature of the response, and whether an agent’s action is authorized.
- Not seeing the goal as locking AI down until it’s safe by omission, but to give employees room to adopt and experiment with AI while sensitive data and agent behavior stay inside clear boundaries.
“Can this person open the tool?” is the wrong question for AI. The right one is whether a particular prompt is safe, whether the response is safe, and whether this action is authorized. Build your strategy around answering these questions to ensure employees use AI productively while keeping sensitive data, IP, and agent behavior within the boundaries set for safe AI use.