CVE-2026-0300
CWE-787
103.0
RPSRPS range: 0–105; KEV-listed vulnerabilities can receive an exploitation amplifier.
Description
A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses. Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.
Source: NVD
Signals
- CVSS
- 9.8
- Critical · v3.1
- EPSS
- 31.72%
- Probability of exploitation in the next 30 days (FIRST)
- CISA KEV
- In CISA KEV since May 2026
- Fix commit
- No known fix commit
- Sources: MoreFixes, FreshFixes
- Weakness
- CWE-787
- Published
- 6 May 2026
- Last modified 12 May 2026
How to read these signals: RPS · EPSS · CISA KEV · Data sources
Get this score from the API
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Data as of 8 Oct 2026, 05:16 UK time