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// CVE · PUBLISHED 2026-05-06

CVE-2026-0300

Palo Alto Networks / Cloud NGFW · Palo Alto Networks / PAN-OS · Palo Alto Networks / Prisma Access · +1

9.3 · CVSS 4.0CriticalCISA KEV

CISA lists this CVE as exploited in the wild. Patch it before anything rated by score alone.

Description

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.

References

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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.