Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

Technical Severity

CVSS v3.1 Metrics

CRITICAL

9.1 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation Likelihood

EPSS Prediction

41.50 %

Predictive Probability

Percentile Rank

97.5 th

Documented as more likely to be exploited than 97.5% of known CVEs.

Detection Date

May 29, 2026

Remediation Due

Jun 01, 2026

CISA Catalog Active

Threat Analysis

Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.

Remediation Directive

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

External Intelligence

https://security.paloaltonetworks.com/CVE-2026-0257

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2026-0257