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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.

CVE-2026-85046 is a type confusion vulnerability in Google Chrome that was exploited in early September 2026 by the Chinese threat actor UTA0565. The attacker conducted targeted phishing campaigns impersonating legitimate organizations to deliver an exploit chain leveraging this vulnerability along with others (CVE-2026-87491 and CVE-2026-85880). The exploitation resulted in deployment of CLEANGULP, a previously undocumented malware family capable of command execution, file operations, and beacon object file execution. The malware communicated with its command-and-control infrastructure over encrypted HTTP using custom encoding. The coordinated use of this exploit kit by multiple Chinese APT groups suggests widespread sharing within the Chinese cyber espionage community during the vulnerability window. The CVSS v3.1 score is 8.8, indicating high severity with network attack vector, low attack complexity, no privileges required, user interaction required, and high impact on confidentiality, integrity, and availability.

Detailed information about CVE-2026-85046: Type confusion in Google Chrome affecting Google Chrome. Get real-time updates, technical details, and mitigation str

CVE-2026-85046: Type confusion in Google Chrome - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-85046: Type confusion in Google Chrome

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