CVE-2026-0257: Palo Alto Networks PAN-OS (High, CVSS 7.8)
- CVSS
- 7.8 High (v4.0)
- EPSS
- 96.9% chance of exploitation in the next 30 days (higher than 99.8% of CVEs)
- Exploited in the wild
- Yes, on CISA’s KEV list since May 29, 2026; used by ransomware
- Public exploit
- Yes, reported in a Nuclei template and 7 GitHub repositories
- Weakness
- CWE-565
- Vector
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/AU:N/R:A/V:D/RE:M/U:Red- Published
- May 13, 2026
- CISA fix-by date
- Jun 1, 2026 (for US federal agencies)
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.
Description from the National Vulnerability Database.
What to do
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.
Check whether you run Palo Alto Networks PAN-OS, then apply the vendor’s fix or mitigation from the advisories below. Because this flaw is exploited or has public exploit code, treat it as urgent and check for signs of compromise, not just the patch level.
Advisories and fixes
ThreatRoundup coverage
Qilin and INC Ransomware Slip Past MFA Through Unpatched PAN-OS
Sources: NVD, FIRST EPSS, CISA KEV, and public exploit databases (availability only). ThreatRoundup reports whether public exploit code exists but never links to it: fake proof-of-concepts that infect security researchers are common. This page updates automatically.