CVE-2026-0300

UNKNOWNKnown Exploited

CISA Known Exploited Vulnerability

https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300

Remediation deadline: May 9, 2026

Description

Palo Alto Networks PAN-OS contains an out-of-bounds write vulnerability in the User-ID Authentication Portal (aka Captive Portal) service that can allow an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.

Timeline

Published:May 6th, 2026 12:00 AM

Last modified:May 6th, 2026 12:00 AM

Added to KEV:May 6th, 2026

CVSS Scoring

No CVSS v3 score available

Affected Software

From NVD CPE configuration data

Vendors

Palo Alto Networks

Products

PAN-OS

Weaknesses (CWE)

CWE-787

References & Reports

Advisories, patches, and third-party reports

No references available.

Source: CISA KEV + NVD · Data may lag official sources by up to one minute