CVEs / CVE-2026-0257
CVE-2026-0257: Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
- Known exploited in the CISA KEV catalog since 29 May 2026
- critical 9.1 CVSS 3.1 (NVD)
- EPSS 95% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.
Description
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Palo Alto Networks PAN-OS | from 12.1.0, before 12.1.7, 12.1.4-h6 | 12.1.7, 12.1.4-h6 |
| Palo Alto Networks PAN-OS | from 11.2.0, before 11.2.12, 11.2.10-h7, 11.2.7-h14, 11.2.4-h17 | 11.2.12, 11.2.10-h7, 11.2.7-h14, 11.2.4-h17 |
| Palo Alto Networks PAN-OS | from 11.1.0, before 11.1.15, 11.1.13-h5, 11.1.10-h25, 11.1.7-h6, 11.1.6-h32, 11.1.4-h33 | 11.1.15, 11.1.13-h5, 11.1.10-h25, 11.1.7-h6, 11.1.6-h32, 11.1.4-h33 |
| Palo Alto Networks PAN-OS | from 10.2.0, before 10.2.18-h6, 10.2.16-h7, 10.2.13-h21, 10.2.10-h36, 10.2.7-h34 | 10.2.18-h6, 10.2.16-h7, 10.2.13-h21, 10.2.10-h36, 10.2.7-h34 |
| Palo Alto Networks Prisma Access | from 10.2.0, before 10.2.10-h36 | 10.2.10-h36 |
| Palo Alto Networks Prisma Access | from 11.2.0, before 11.2.7-h13 | 11.2.7-h13 |
| Siemens RUGGEDCOM APE1808 | all versions | — |
Exploitation
| In CISA KEV since | 29 May 2026 |
|---|---|
| Due date for US federal agencies | 1 Jun 2026 |
| Used in ransomware campaigns | Known |
| 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. |
Severity
| CVSS 3.1 | 9.1 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NScored by NVD |
|---|---|
| Weakness | CWE-565 |
References
- CVE-2026-0257 on NVD
- CVE-2026-0257 in the CISA KEV catalog
- https://security.paloaltonetworks.com/CVE-2026-0257 (cited by CISA)
- 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
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.