Vulnerability in Palo Alto Networks Cloud Ngfw
CVE-2026-0257
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.969 (99.9th percentile), scored .
Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 99.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.952 · newest: 0.969 · change: +0.017
Affected products
- Palo Alto Networks Cloud Ngfw — versions All
- Palo Alto Networks Pan-Os — versions 12.1.0, 11.2.0, 11.1.0
- Palo Alto Networks Prisma Access — versions 10.2.0, 11.2.0
- Paloaltonetworks Pan-Os — versions 10.2.7, 10.2.8, 10.2.9
- Paloaltonetworks Prisma Access
- Siemens Ruggedcom Ape1808
- Siemens Ruggedcom Ape1808 Firmware
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
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.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- security.paloaltonetworks.com/CVE-2026-0257 (vendor-advisory, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-0257?
- CVE-2026-0257 is a critical-severity vulnerability in Palo Alto Networks Cloud Ngfw, classified under Reliance on Cookies without Validation and Integrity Checking. CVSS score: 9.1/10. Published 2026-05-13.
- How severe is CVE-2026-0257?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2026-0257 known to be exploited?
- Yes. CVE-2026-0257 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-29), indicating it is being actively exploited. 12 public proof-of-concept repositories are indexed.