Actively exploited vulnerability

CVE-2026-0257: Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

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

CISA KEV source 29 May 2026 added 1 Jun 2026 remediation due

Affected product

Palo Alto Networks · PAN-OS

Known ransomware use: Unknown

Required action

Follow the source advisory and validate exposure in your environment.

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

Related Yasna coverage

Recent reporting that mentions CVE-2026-0257.

Security Affairs15 Jun 2026

Palo Alto Warns of Exploitation of VPN Bypass Exploits (CVE-2026-0257) in PAN-OS Flaw

Palo Alto Networks warns that attackers are actively exploiting CVE-2026-0257, a PAN-OS flaw that lets unauthorized users bypass authentication and establish VPN connections. Palo Alto Networks has confirmed active exploitation of CVE-2026-0257, a PAN-OS authentication bypass vulnerability affecting GlobalProtect portals and gateways. Palo Alto Networks addressed the vulnerability on May 13. Two weeks later, cybersecurity firm Rapid7 […]

Security Affairs1 Jun 2026

U.S. CISA adds Palo Alto Networks PAN-OS flaw to its Known Exploited Vulnerabilities catalog

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Palo Alto Networks PAN-OS flaw to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added Palo Alto Networks PAN-OS flaw, tracked as CVE-2026-0257 (CVSS score of 7.8), to its Known Exploited Vulnerabilities (KEV) catalog. Palo Alto Networks addressed the vulnerability CVE-2026-0257 on May […]

Security Affairs1 Jun 2026

CVE-2026-0257: Rapid7 Caught Attackers Abusing Forged VPN Cookies Against Multiple Customers

CVE-2026-0257 lets attackers forge Palo Alto GlobalProtect auth cookies and bypass VPN login. Exploitation confirmed since May 17. Palo Alto Networks addressed the vulnerability CVE-2026-0257 on May 13. Two weeks later, cybersecurity firm Rapid7 confirmed active exploitation across multiple customer environments. The flaw impacts the GlobalProtect portal and gateway components of Palo Alto Networks PAN-OS […]