Skip to main content
Meo

Security tracker

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

In short

Palo Alto Networks PAN-OS has a weakness classified as CWE-565. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-05-29. NVD lists CVSS 4.0 at 7.8 HIGH. CISA reports known ransomware campaign use.

What it is

“Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.” — CISA KEV, retrieved 2026-11-01
“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.” — NVD, retrieved 2026-11-01

Who is affected

Palo Alto Networks PAN-OS. NVD lists the following versions as affected:

  • Paloaltonetworks PAN-OS: before 10.2.7
  • Paloaltonetworks PAN-OS: version 10.2.7
  • Paloaltonetworks PAN-OS: version 10.2.8
  • Paloaltonetworks PAN-OS: version 10.2.9
  • Paloaltonetworks PAN-OS: version 10.2.10
  • Paloaltonetworks PAN-OS: version 10.2.11
  • Paloaltonetworks PAN-OS: version 10.2.12
  • Paloaltonetworks PAN-OS: version 10.2.13
  • Paloaltonetworks PAN-OS: version 10.2.14
  • Paloaltonetworks PAN-OS: version 10.2.15
  • Paloaltonetworks PAN-OS: version 10.2.16
  • Paloaltonetworks PAN-OS: version 10.2.17
  • Paloaltonetworks PAN-OS: version 10.2.18
  • Paloaltonetworks PAN-OS: version 11.1.0
  • Paloaltonetworks PAN-OS: version 11.1.1
  • Paloaltonetworks PAN-OS: version 11.1.2
  • Paloaltonetworks PAN-OS: version 11.1.3
  • Paloaltonetworks PAN-OS: version 11.1.4
  • Paloaltonetworks PAN-OS: version 11.1.5
  • Paloaltonetworks PAN-OS: version 11.1.6
  • Paloaltonetworks PAN-OS: version 11.1.7
  • Paloaltonetworks PAN-OS: version 11.1.8
  • Paloaltonetworks PAN-OS: version 11.1.9
  • Paloaltonetworks PAN-OS: version 11.1.10
  • Paloaltonetworks PAN-OS: version 11.1.11
  • Paloaltonetworks PAN-OS: version 11.1.12
  • Paloaltonetworks PAN-OS: version 11.1.13
  • Paloaltonetworks PAN-OS: version 11.1.14
  • Paloaltonetworks PAN-OS: version 11.2.0
  • Paloaltonetworks PAN-OS: version 11.2.1
  • Paloaltonetworks PAN-OS: version 11.2.2
  • Paloaltonetworks PAN-OS: version 11.2.3
  • Paloaltonetworks PAN-OS: version 11.2.4
  • Paloaltonetworks PAN-OS: version 11.2.5
  • Paloaltonetworks PAN-OS: version 11.2.6
  • Paloaltonetworks PAN-OS: version 11.2.7
  • Paloaltonetworks PAN-OS: version 11.2.8
  • Paloaltonetworks PAN-OS: version 11.2.9
  • Paloaltonetworks PAN-OS: version 11.2.10
  • Paloaltonetworks PAN-OS: version 11.2.11
  • Paloaltonetworks PAN-OS: version 12.1.2
  • Paloaltonetworks PAN-OS: version 12.1.3
  • Paloaltonetworks PAN-OS: version 12.1.4
  • Paloaltonetworks PAN-OS: version 12.1.5
  • Paloaltonetworks PAN-OS: version 12.1.6
  • Paloaltonetworks Prisma Access: all versions listed (no range given)
  • Siemens Ruggedcom ape1808 Firmware: all versions listed (no range given)

Exploitation status

CISA KEV added: 2026-05-29. Known ransomware campaign use: Known (reported by CISA). Due date CISA set for US federal civilian agencies: 2026-06-01.

Scores

NVD CVSS 4.0: 7.8 HIGH; 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/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; source [email protected].

EPSS by FIRST: 95.01%; percentile 99.86; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-565.

Timeline

Source events
DateEvent
2026-05-13T19:17:01.040NVD published
2026-05-29CISA KEV added
2026-06-01CISA KEV due
2026-10-26T14:10:00.130NVD last modified
2026-10-31FIRST EPSS score

CISA 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.” — CISA KEV

What to do

  • Confirm whether you run Palo Alto Networks PAN-OS and which version.
  • Apply the vendor update or mitigation in the advisory.
  • Follow CISA’s required action.
  • Review the vendor guidance on signs of compromise.
  • Track the fix through completion.

References

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.

Check your own domain's public security settings

The snapshot checks a domain you own or are authorized to check for DNS, HTTPS/TLS and web-header hygiene. It does not test for this CVE.

Check your own domain's public security settingsBook a scoping call