Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since May 29, 2026.
CVE-2026-0257
Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
Added to KEV May 29, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-0257
- CWE
- CWE-565
- Affected products
- PAN-OS · Palo Alto Networks PAN-OS · Palo Alto Networks
What happened
Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.
What it means for your business
Palo Alto Networks PAN-OS is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-0257). Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection. CISA remediation due date: 2026-06-01. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: June 1, 2026
Sources
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