high severity ยท published 2026-10-20
A remote attacker who has already taken over a browser renderer process can get around the same-origin rule that keeps websites apart through a crafted web page, using a missing authorization flaw in the SiteIsolation component of Chrome. Chromium rates it Medium.
Fixed in: 156.0.8078.47
CVE: CVE-2026-113281
Source: NVD
Fixlane has a reviewed fix procedure for this incident: a read-only check first, then the fix. Ask the Telegram bot, or connect an AI agent to the Fixlane MCP server and call get_fix_prompt with incident id 458 and your operating system.