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CVE record · CVE-2026-0300

PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal

CVSS 9.3 CriticalCriticalIn CISA KEVEPSS 0.42 · 98th percentile

Critical, because:

  • In CISA’s KEV catalogue since 6 May 2026: it is known to be exploited.
  • CVSS score 9.3: 9.0 or more.
  • CVSS score 9.3 (7.0 or more) and EPSS 0.42 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: palo_alto) at 6 May 2026, 18:57 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Palo Alto Networks Cloud NGFW
  • unaffected All custom
Other versions: unaffected
Palo Alto Networks PAN-OS
  • affected 12.1.0 to before 12.1.7 custom
  • affected 11.2.0 to before 11.2.12 custom
  • affected 11.1.0 to before 11.1.15 custom
  • affected 10.2.0 to before 10.2.18-h6 custom
Other versions: unaffected
Palo Alto Networks Prisma Access
  • unaffected All custom
Other versions: unaffected
Identifiers
CVE-2026-0300
CNA
palo_alto
Weakness (CWE)
CWE-787
Tags
Published
6 May 2026
Updated
15 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.3 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red CNA (palo_alto)Used for this record
8.7 High 4.0 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red CNA (palo_alto)
  • CISA KEV Listed since 6 May 2026: known to be exploited.
  • EPSS 0.42, the 98th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 6 May 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.