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CVE-2026-0257

PAN-OS: GlobalProtect Authentication Bypass Vulnerabilities

  • High 7.8
  • Exploited: added to CISA KEV 29 May 2026
  • Used in ransomware campaigns

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.

Key facts

Published
13 May 2026
Last changed
15 Oct 2026
Assigned by
palo_alto
KEV added
29 May 2026
KEV fix due
1 Jun 2026
Used in ransomware
Yes, according to CISA
EPSS
95.642% likely to be exploited in the next 30 days, higher than 99.872% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 7.8CVSS 4.0, Highfrom the CNA (palo_alto)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

What to do

  • Note: With this fix, if the firewall is configured to use an authentication override cookie for the GlobalProtect Portal or Gateway, it will regenerate the cookie using a more secure method. Therefore, GP users will need to re-authenticate after a PAN-OS upgrade, even if a valid cookie is present. This is a one time requirement. Once they re-authenticate after the upgrade, the authentication override cookie and its validity will work as they do today.CNA solution statement
  • 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 required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

CAPEC-114 Authentication Abuse (CNA impact statement)

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
Palo Alto NetworksCloud NGFW
  • Default status: unaffected
  • All (unaffected)
Palo Alto NetworksPAN-OS
  • Default status: unaffected
  • 12.1.0 up to but excluding 12.1.7, 12.1.4-h6 (affected); at 12.1.7 unaffected, at 12.1.4-h6 unaffected
  • 11.2.0 up to but excluding 11.2.12, 11.2.10-h7, 11.2.7-h14, 11.2.4-h17 (affected); at 11.2.12 unaffected, at 11.2.10-h7 unaffected, at 11.2.7-h14 unaffected, at 11.2.4-h17 unaffected
  • 11.1.0 up to but excluding 11.1.15, 11.1.13-h5, 11.1.10-h25, 11.1.7-h6, 11.1.6-h32, 11.1.4-h33 (affected); at 11.1.15 unaffected, at 11.1.13-h5 unaffected, at 11.1.10-h25 unaffected, at 11.1.7-h6 unaffected, at 11.1.6-h32 unaffected, at 11.1.4-h33 unaffected
  • 10.2.0 up to but excluding 10.2.18-h6, 10.2.16-h7, 10.2.13-h21, 10.2.10-h36, 10.2.7-h34 (affected); at 10.2.18-h6 unaffected, at 10.2.16-h7 unaffected, at 10.2.13-h21 unaffected, at 10.2.10-h36 unaffected, at 10.2.7-h34 unaffected
Palo Alto NetworksPrisma Access
  • Default status: unaffected
  • 10.2.0 up to but excluding 10.2.10-h36 (affected); at 10.2.10-h36 unaffected
  • 11.2.0 up to but excluding 11.2.7-h13 (affected); at 11.2.7-h13 unaffected

Timeline

  1. 13 May 2026 Initial publication.
  2. 13 May 2026 Published
  3. 29 May 2026 CVE-2026-0257 added to CISA KEV
  4. 29 May 2026 Added to the CISA KEV catalogue
  5. 29 May 2026 Updated exploitation status.

Weakness

Related coverage

References