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CVE-2026-0300 PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal (Severity: CRITICAL)

criticalknown exploitedpublic exploitCVE-2026-0300
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.

CSIRTS triage

vendor: Palo Alto Networksproduct: PAN-OSOther
What
An unauthenticated buffer overflow vulnerability exists in the User-ID Authentication Portal.
Who is affected
Deployments of PAN-OS are affected.
Urgency
Remediation is critical due to active exploitation and critical severity.
Action
Upgrade to the patched version of PAN-OS.

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Details

Source
Palo Alto Networks Security Advisories (INTL · vendor-psirt · site)
Severity
critical
Published
2026-05-28
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://security.paloaltonetworks.com/CVE-2026-0300

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-0300coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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