# CVE-2026-0300

> **Palo Alto Networks PAN-OS** vulnerability · **listed in CISA Known Exploited Vulnerabilities catalog**.

## 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.

## Key facts

- **CVE ID:** CVE-2026-0300
- **Vendor:** Palo Alto Networks
- **Product:** PAN-OS
- **Published:** 2026-05-06
- **CISA remediation due date:** 2026-05-09

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-0300
- CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

## Citation

> AI Analytics. CVE-2026-0300. Retrieved 2026-05-16 from https://api.ai-analytics.org/cve/CVE-2026-0300. Derived from NIST NVD + CISA KEV. Licensed CC0.

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