VIR Vulnerability Intelligence Relay

CVE-2026-0300

critical KEV
Published 2026-05-06 · Modified 2026-05-06
CVSS v3
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2
—
VIR risk
10.0

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.

CISA KEV

Vendor
Palo Alto Networks
Product
PAN-OS
Due date
2026-05-09

Predictions

Exploit likelihood
99%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: cisa-kev — https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300

vendor Authored 2026-05-27

Vendor advisory: psirt@paloaltonetworks.com — https://security.paloaltonetworks.com/CVE-2026-0300

Exploits

References

CWEs

CWE-787

Verify integrity in audit chain (admin only). AS-IS.