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CVE-2026-0300

PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal

A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses. Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.

CVSS 4.0 · 8.7 High EPSS 41.7% KEV · Listed
Vendors
Palo Alto Networks Paloaltonetworks Siemens
Products
Cloud Ngfw Pan-os Prisma Access and 50 more
CVE-2026-0228

PAN-OS: Improper Validation of Terminal Server Agent Certificate

An improper certificate validation vulnerability in PAN-OS allows users to connect Terminal Server Agents on Windows to PAN-OS using expired certificates even if the PAN-OS configuration would not normally permit them to do so.

CVSS 4.0 · 1.3 Low EPSS < 1% KEV · Not listed
Vendors
Palo Alto Networks
Products
Cloud Ngfw Pan-os Prisma Access
CVE-2026-0227

PAN-OS: Firewall Denial of Service (DoS) in GlobalProtect Gateway and Portal

A vulnerability in Palo Alto Networks PAN-OS software enables an unauthenticated attacker to cause a denial of service (DoS) to the firewall. Repeated attempts to trigger this issue results in the firewall entering into maintenance mode.

CVSS 4.0 · 6.6 Medium EPSS < 1% KEV · Not listed
Vendors
Palo Alto Networks Paloaltonetworks
Products
Cloud Ngfw Pan-os Prisma Access and 2 more
CVE-2026-0229

PAN-OS: Denial of Service in Advanced DNS Security Feature

A denial-of-service (DoS) vulnerability in the Advanced DNS Security (ADNS) feature of Palo Alto Networks PAN-OS® software enables an unauthenticated attacker to initiate system reboots using a maliciously crafted packet. Repeated attempts to initiate a reboot causes the firewall to enter maintenance mode. Cloud NGFW and Prisma Access® are not impacted by this vulnerability.

CVSS 4.0 · 6.6 Medium EPSS < 1% KEV · Not listed
Vendors
Palo Alto Networks
Products
Cloud Ngfw Pan-os Prisma Access
CVE-2025-0133

PAN-OS: Reflected Cross-Site Scripting (XSS) Vulnerability in GlobalProtect Gateway and Portal

A reflected cross-site scripting (XSS) vulnerability in the GlobalProtect™ gateway and portal features of Palo Alto Networks PAN-OS® software enables execution of malicious JavaScript in the context of an authenticated Captive Portal user's browser when they click on a specially crafted link. The primary risk is phishing attacks that can lead to credential theft—particularly if you enabled Clientless VPN. There is no availability impact to GlobalProtect features or GlobalProtect users. Attackers cannot use this vulnerability to tamper with or modify contents or configurations of the GlobalProtect portal or gateways. The integrity impact of this vulnerability is limited to enabling an attacker to create phishing and credential-stealing links that appear to be hosted on the GlobalProtect portal. For GlobalProtect users with Clientless VPN enabled, there is a limited impact on confidentiality due to inherent risks of Clientless VPN that facilitate credential theft. You can read more about this risk in the informational bulletin PAN-SA-2025-0005 https://security.paloaltonetworks.com/PAN-SA-2025-0005 https://security.paloaltonetworks.com/PAN-SA-2025-0005 . There is no impact to confidentiality for GlobalProtect users if you did not enable (or you disable) Clientless VPN.

CVSS 4.0 · 2.7 Low EPSS 46.3% KEV · Not listed
Vendors
Palo Alto Networks
Products
Cloud Ngfw Pan-os Prisma Access
CVE-2025-4615

PAN-OS: Improper Neutralization of Input in the Management Web Interface

An improper input neutralization vulnerability in the management web interface of the Palo Alto Networks PAN-OS® software enables an authenticated administrator to bypass system restrictions and execute arbitrary commands. The security risk posed by this issue is significantly minimized when CLI access is restricted to a limited group of administrators. Cloud NGFW and Prisma® Access are not affected by this vulnerability.

CVSS 4.0 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Palo Alto Networks Paloaltonetworks
Products
Pan-os Cloud Ngfw Pan-os and 1 more