CVE-2026-0265: PAN-OS GlobalProtect CAS JWT algorithm confusion allows authentication bypass and VPN access
Researcher Harsh Jaiswal (Hacktron) disclosed an authentication bypass in Palo Alto Networks PAN-OS GlobalProtect when Cloud Authentication Service (CAS) is enabled, tracked as CVE-2026-0265. With help from Claude and Ghidra MCP, he found that the firewall's JWT verification trusts the alg field in the token header. An attacker can theref…