Improper Verification of Cryptographic Signature in Palo Alto PAN-OS - CVE-2026-0265
Published: May 19, 2026 / Updated: August 26, 2026
Vulnerability identifier: #VU131771
CSH Severity: High
CVSS v4: 9.3 [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]
CVE-ID: CVE-2026-0265
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
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.
Affected software
Palo Alto PAN-OS
How to mitigate CVE-2026-0265
Install security update from vendor's website.
Palo Alto PAN-OS - addressed in versions 10.2.7-h34, 10.2.10-h36, 10.2.13-h21, 10.2.16-h7, 10.2.18-h6, 11.1.4-h33, 11.1.6-h32, 11.1.7-h6, 11.1.10-h25, 11.1.13-h5, 11.1.15, 11.2.4-h17, 11.2.7-h13, 11.2.10-h6, 11.2.12, 12.1.4-h5, 12.1.7
Links to Public Exploits and PoC-codes
- Exploit #12977 - PAN-OS GlobalProtect CAS CVE-2026-0265 Vulnerability Checker (August 26, 2026)
- Exploit #12741 - palo-alto-cve-2026-0265-checker (Python script to sweep a fleet of Palo Alto firewalls and Panoramas via SSH, check PAN-OS version against CVE-2026-0265 (Authentication Bypass via Cloud Authentication Service), detect whether CAS is actually configured, a (May 22, 2026)