Menlo Security has expanded Menlo Agent Runtime Security (MARS) with new capabilities that extend the controls enterprises already use to govern their people to the AI agents now working alongside them. MARS is a cloud-based Browser Security Platform that protects AI assistants, coding agents, and autonomous agents by sanitizing the web pages and files they read, neutralizing prompt injection, and blocking data exfiltration.
MARS secures AI assistants, coding agents, and autonomous agents including Microsoft Copilot, Gemini, and Claude Code.
Strips prompt injection and hidden instructions from web pages and files before agents see them.
File sanitization removes hidden instructions and malware from SharePoint and OneDrive files.
Adaptive DLP extends data protections to agents with masking and per-agent policy controls.
Provides token-based authentication, activity logs, session recording, and human oversight.
Based on over 70 customer conversations addressing agentic security concerns.
An AI agent will read and carry out an instruction hidden in white-on-white text, a file's metadata, or a single human-invisible pixel, something no person would ever notice. Mandiant's 2026 AI Risk and Resilience report names prompt injection a top threat to AI applications. Gartner projects that by the end of 2026, 40% of enterprise applications will include task-specific AI agents, up from less than 5% in 2025, faster than most enterprises can secure them. Most enterprises face a bad choice: block agents and fall behind, or allow them and rely on built-in controls that were never designed for the agentic attack surface. MARS is built for the middle, giving security teams the guardrails to approve agentic AI and move fast without choosing between speed and safety.
MARS runs web activity in the Menlo Cloud and cleans pages and files, including downloads and uploads, before the agent sees them. Isolation and threat removal strips prompt injection and hidden instructions from web pages and files. File sanitization removes hidden instructions and malware from files pulled from sources like SharePoint and OneDrive. Adaptive data governance extends DLP protections to agents with masking, access controls, and granular per-agent policy. Agent authentication and attribution provides token-based authentication for seamless Menlo platform access and per-agent visibility. Human oversight and forensics gives security teams activity logs, session recording, and the ability to take over live agent browser sessions.
Because MARS runs on the same Browser Security Platform Menlo already uses to govern human employees, security teams apply one policy framework across both people and agents, with granular, agent-specific controls. Its isolation-first design aligns with emerging standards, including the OWASP agentic guidelines, the NIST AI Risk Management Framework, and the EU AI Act.
"Every enterprise is racing to put AI agents to work, but agents operate at machine speed without human skepticism," said Bill Robbins, Chief Executive Officer of Menlo Security. "They live in the browser and the everyday tools our teams rely on, which is exactly where attackers are aiming. MARS provides the essential runtime guardrails so security teams can confidently say yes to agentic AI instead of standing in its way."
About Menlo Security
Menlo Security is the pioneer of the Browser Security Platform, the industry's first infrastructure designed to govern a hybrid workforce of humans and autonomous AI agents. By centering the browser as the new enterprise operating system, Menlo provides a "Guardian Runtime" that resolves the unique risks created when AI agents operate at machine speed without human skepticism. The Menlo platform enables the agentic enterprise to scale AI with confidence, providing universal connectivity to legacy data and unified zero-day threat prevention across every session. Trusted by over 1,000 global enterprises, including eight of the ten largest financial institutions and major government agencies, Menlo protects over 8 million users and millions of simultaneous AI agent sessions. Headquartered in Mountain View, California, and backed by investors including JPMorgan Chase, American Express Ventures, and Vista Equity Partners, Menlo is securing the browser for the agentic age.
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