Known exploited vulnerability
CVE-2026-0257
The short answer
CVE-2026-0257 affects Palo Alto Networks Cloud NGFW and is rated high (CVSS 7.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-05-29: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-565.
Severity
7.8 high
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:A/V:D/RE:M/U:Red
Exploited (CISA KEV)
Yes, since May 29, 2026
Federal due date Jun 1, 2026
EPSS, next 30 days
96%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- None
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
Cloud NGFW, PAN-OS, Prisma Access, RUGGEDCOM APE1808. NVD's record lists the exact affected versions.
References
- security.paloaltonetworks.com/CVE-2026-0257 Vendor Advisory
- cert-portal.siemens.com/productcert/html/ssa-967325.html Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0257 US Government Resource
Questions
Is CVE-2026-0257 being exploited?
Yes. CISA added CVE-2026-0257 to its Known Exploited Vulnerabilities catalog on 2026-05-29, with a federal remediation due date of 2026-06-01. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2026-0257?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
Related
Latest CVEs this week
Critical and High CVEs from the last 7 days, with KEV and EPSS.
Exploited vulnerabilities by vendor
Every vendor in CISA's KEV catalog, with its count.
Palo Alto Networks exploited vulnerabilities
Everything CISA lists as exploited for Palo Alto Networks.
Vulnerability watch
A briefing and a fix pull request when an advisory hits your dependencies.
Know the day a CVE lands in your code
Connect a GitHub repository and ZeusQA checks its dependencies daily, briefs each advisory and opens the fix. Three test runs free, no card.