VERY IMPORTANT

In September 2026, two Chinese threat actors, UTA0560 and JungleBamboo, were observed exploiting an identical Chrome zero-day vulnerability chain targeting NGOs and other organizations. The exploitation leveraged CVE-2026-85046 and CVE-2026-87491 in Chrome alongside CVE-2026-85880 in Windows kernel. These vulnerabilities had been patched in Chromium source code but not yet released to Chrome users, creating a patch-gap exploitation window. UTA0560 conducted spear-phishing campaigns using financial lures to deliver GRIMWEDGE JScript backdoor for reconnaissance and command execution. JungleBamboo employed generic phishing themes to deploy SUPERSTOMP loader, which installed the LONGTALE Chrome extension designed for credential theft, keylogging, and surveillance. Both actors used byte-for-byte identical shellcode, suggesting a shared exploit supply chain while deploying distinct post-exploitation tools tailored to their operational objectives.