Browser Agent Data Exposure Checklist

One compromised tab shouldn't mean every tab.

Researchers studying seven popular agentic browsers found that four of them create ways for a malicious actor to bypass the same-origin policy — the fundamental browser security protocol that normally keeps a banking tab's data isolated from every other open tab — enabling cross-site data exfiltration through prompt injection and memory poisoning. This checklist scores your own AI browser agent setup against the specific privacy exposure this creates: whether sensitive tabs stay closed while the agent operates elsewhere, whether the agent runs in an isolated profile from your main accounts, and whether autofill and form-submission require your explicit confirmation.

• →Built directly around the documented UW research finding 4 of 7 agentic browsers bypass same-origin isolation
• →Weights closing sensitive tabs (banking, healthcare) while the agent operates elsewhere as the highest-priority check
• →Covers profile isolation, autofill restriction, and required confirmation for data-submitting actions
• →Distinct from technical/developer-focused agent security — this is a personal privacy exposure audit
• →Watermarked by Cikal Studio Labs · Works on any device, no install required