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CVE-2026-0300

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CVE-2026-0300

Published: May 6, 2026

Modified: May 12, 2026

PUBLISHED

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.

VendorProductVersions

Palo Alto Networks

Cloud NGFW

unaffected
All

Palo Alto Networks

PAN-OS

affected
12.1.0 - < 12.1.7
affected
11.2.0 - < 11.2.12
affected
11.1.0 - < 11.1.15
affected
10.2.0 - < 10.2.18-h6

Palo Alto Networks

Prisma Access

unaffected
All

Weaknesses (CWE)

CWE-787

References

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