CVE detail
CVE-2026-0300: Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability
Source: CISA Known Exploited Vulnerabilities catalog · back to feed
Vendor / product
Palo Alto Networks · PAN-OS
- Date added (KEV)
- May 06, 2026
- CISA due date
- May 09, 2026
- Ransomware campaign 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 access to only trusted zones. - Disable User-ID Authentication Portal if not required. 5/13/2026: Palo Alto has released a variety of patches. If these are relevant to your environment, please apply the designated patch.
Scorifya interpretation
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Plain English
Technical detail
From CISA
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.
https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300
See what attackers can see on your domain
This vulnerability is on CISA's Known Exploited Vulnerabilities list, so it is being exploited in the wild right now. Scorifya can't test for Palo Alto Networks directly, but in about 30 seconds it shows what your own domain exposes publicly across TLS, security headers, DNS, and cookies: the surface attackers probe first.
SOC 2 compliance
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See Scorifya Controls →References
- https://security.paloaltonetworks.com/CVE-2026-0300MitigationVendor Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-967325.htmlThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300US Government Resource
Other recent CVEs from Palo Alto Networks
- CVE-2026-0257PAN-OS, Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
- CVE-2025-0111PAN-OS, Palo Alto Networks PAN-OS File Read Vulnerability
- CVE-2025-0108PAN-OS, Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
- CVE-2024-3393PAN-OS, Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability
- CVE-2024-0012PAN-OS, Palo Alto Networks PAN-OS Management Interface Authentication Bypass Vulnerability