Browser security company Menlo Security Inc. today announced a new Browser Security Platform that is purpose-built to secure “agentic enterprise,” where autonomous artificial intelligence agents increasingly outnumber human employees and the browser has become the operating system for both.

The new offering sees Menlo provide a unified control plane to apply machine-speed governance and threat prevention to both human and non-human actors.

As enterprises are deploying AI agents to automate complex workflows, the agents often utilize headless browsers or leverage web protocols directly, operating entirely outside the scope of traditional browser security. Menlo argues that threat actors are already exploiting this transition with attacks invisible to the human eye, such as prompt injection via documents and steganography.

The Menlo BSP takes the issue head-on by treating humans and agents as equal participants in the workforce, with the new platform providing AI agent security, universal connectivity, deterministic visibility and least-privileged agent access.

Menlo AI Agent Security acts as a “Guardian Runtime” for the agentic economy. It enforces instruction-data separation to ensure agents never mistake malicious data for legitimate commands. In addition, universal connectivity translates complex, application programming interface-deficient legacy web user interfaces into sanitized, machine-readable data.

Meanwhile, deterministic visibility offers full forensic intel and real-time session-flow views. And finally, least-privileged agent access enforces granular controls via Menlo Secure Application Access to prevent autonomous agents from moving laterally or extracting unauthorized data.

The platform moves the security control point directly into the browser session to provide consistent protection and what Menlo calls “Architectural Immunity.” That’s a state where evasive threats are fundamentally unable to execute because the attack surface is neutralized in the cloud through multimodal visual analysis before reaching an AI reasoning workflow or a human endpoint.

By providing a unified trust layer, Menlo says, it eliminates the most sophisticated threats of the agentic age at their point of entry.

“AI agents represent a fundamental shift in enterprise computing,” said Ramin Farassat, chief product officer at Menlo Security. “For the first time, security teams have a single control plane that applies the same governance policies to an AI agent processing invoices as to the human CFO approving them — at machine speed, with full forensic visibility.”

Menlo Security has raised $250 million in funding, including rounds of $25 million in June 2015, $40 million in December 2017, $75 million in June 2019 and $100 million in November 2020.

Investors in the company include Vista Equity Partners Management, Neuberger Berman Group, General Catalyst Group Management, JPMorgan Chase & Co., American Express Ventures, Ericsson Ventures, HSBC Holdings plc, Engineering Capital, Osage University Partners and Sutter Hill Ventures LP.

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