Improper Verification of Cryptographic Signature in Palo Alto PAN-OS - CVE-2026-0265
Published: May 19, 2026
Vulnerability identifier: #VU131771
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-0265
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Palo Alto Networks, Inc.
Affected software:
Palo Alto PAN-OS
Palo Alto PAN-OS
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authentication controls.
The vulnerability exists due to improper verification of cryptographic signature in the Cloud Authentication Service (CAS) authentication mechanism when handling authentication requests on a login interface with CAS enabled. A remote attacker can send a crafted authentication request to bypass authentication controls.
The risk is higher when CAS is enabled on the management interface.
How to mitigate CVE-2026-0265
Install security update from vendor's website.