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CVE-2026-0300

CRITICAL · CVSS 9.3 · Analyzed

Published: 2026-05-06 · Updated: 2026-10-26 · Source: NVD

Stored catalog record

Source record retrieved 2026-10-28T10:20:01.122315+00:00. Scheduled imports handle updates; this page does not assert that the provider was queried just now.

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Vulnerability overview

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.

Patch review priority

Known exploitation: prioritize review

  • CISA KEV lists real-world exploitation.

FIRST EPSS: 41.71% · percentile 98.7 · score date 2026-10-28.

EPSS estimates probability of exploitation in the next 30 days. It does not measure your exposure or prove exploitation. The elevated threshold is 10%; CISA KEV takes precedence. About FIRST EPSS ↗

Severity and scoring

CVSS score
9.3 · CRITICAL
CVSS version
4.0
CVSS vector
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:C/RE:M/U:Red
Weaknesses
CWE-787

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Listed in CISA’s Known Exploited Vulnerabilities catalog.

Affected product
Palo Alto Networks · PAN-OS
Added to catalog
2026-05-06
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.
CISA remediation due date
2026-05-09

CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.0:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.1:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.2:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.3:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.4:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.5:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.6:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h12:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h16:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h19:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h21:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h24:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h3:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h32:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h6:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h8:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h10:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h12:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h14:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h17:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h18:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h2:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h21:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h27:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h3:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h30:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h31:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h4:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h5:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h7:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h9:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.12:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h10:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h16:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h18:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h2:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h3:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h4:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h5:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h7:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.14:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.15:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:h4:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:h6:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.17:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.18:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.18:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:10.2.18:h5:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.0:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.1:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.2:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.3:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h13:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h15:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h16:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h17:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h18:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h25:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h27:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h32:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h4:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h7:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h9:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.5:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h10:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h14:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h17:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h19:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h2:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h20:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h21:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h22:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h23:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h25:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h29:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h3:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h4:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h5:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h6:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h7:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.7:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.7:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.7:h2:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.7:h4:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.8:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.9:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h10:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h12:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h21:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h4:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h5:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h7:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h9:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.11:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.12:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.13:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.13:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.13:h2:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.13:h3:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.1.14:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.0:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.1:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.2:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.3:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h10:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h11:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h12:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h14:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h15:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h2:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h4:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h5:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h6:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h7:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h8:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h9:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.5:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.6:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h10:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h11:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h12:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h2:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h3:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h4:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h7:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h8:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.8:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.9:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:h1:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:h2:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:h3:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:h4:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:h5:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:11.2.11:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:12.1.2:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:12.1.3:*:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:12.1.4:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:12.1.4:h2:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:12.1.4:h3:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:12.1.5:-:*:*:*:*:*:*

  • cpe:2.3:o:paloaltonetworks:pan-os:12.1.6:-:*:*:*:*:*:*

  • cpe:2.3:o:siemens:ruggedcom_ape1808_firmware:-:*:*:*:*:*:*:*

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

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Read the official NVD record ↗

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