CVE-2026-0300 — Actively Exploited: PAN-OS (Palo Alto Networks)
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.
| CVE ID | CVE-2026-0300 |
|---|---|
| Vendor | Palo Alto Networks |
| Product | PAN-OS |
| Vulnerability name | Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability |
| Date added | 2026-05-06 |
| Remediation due | 2026-05-09 |
| Known ransomware use | Unknown |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal ac |
| 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. |
| Source | CISA Known Exploited Vulnerabilities |
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