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

CISA Known Exploited Vulnerabilities

Name

Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

Vendor

Palo Alto Networks

Product

PAN-OS

Added to the catalog

2026-05-29

Due date for US federal agencies

2026-06-01

Weaknesses

CWE-565

Catalog version

2026.10.30

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

Required action (CISA)

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

Ransomware use: CISA marks this vulnerability as known to be used in ransomware campaigns. CISA does not say which group used it.

Links in CISA's notes

• https://security.paloaltonetworks.com/CVE-2026-0257
• https://nvd.nist.gov/vuln/detail/CVE-2026-0257

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2026-05-13T19:17:01.040

Last modified

2026-10-26T14:10:00.130

Weaknesses

CWE-565

Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection.

Panorama and Cloud NGFW are not impacted by these issues.

References

• https://security.paloaltonetworks.com/CVE-2026-0257 (Vendor Advisory)
• https://cert-portal.siemens.com/productcert/html/ssa-967325.html (Third Party Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0257 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:42:31.494Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-0257

CVE record

Title (CNA)

PAN-OS: GlobalProtect Authentication Bypass Vulnerabilities

Assigner

palo_alto

State

PUBLISHED

Published

2026-05-13T18:15:10.172Z

Updated

2026-10-15T01:11:26.182Z

Problem types

CWE-565 Reliance on Cookies without Validation and Integrity Checking

Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection.

Panorama and Cloud NGFW are not impacted by these issues.

References

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

Read on 2026-11-03T02:18:11.488Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/0xxx/CVE-2026-0257.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

MITRE D3FEND™ knowledge graph. © 2025 The MITRE Corporation.
"The MITRE Corporation (MITRE) hereby grants you a non-exclusive, royalty-free license to use D3FEND for research, development, and commercial purposes. Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." Terms: https://d3fend.mitre.org/tou/