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CriticalKEVRansomware

CVE-2026-0257 — PAN-OS: GlobalProtect Authentication Bypass Vulnerabilities

CVE-2026-0257 · PAN-OS · CVSS 9.1 · KEV

In brief

Severity · CVSS
Critical9.1CVSS 3.1, Critical
EPSS
96%
CISA KEV
Known exploited, listed since 29 May 2026
Products
PAN-OS
Published · Modified
·
Last verified

Summary

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

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

6 branches with a published fixed release

Palo Alto Networks PAN-OS

Source: CVE-2026-0257

  1. 12.1
    Affected versions>= 12.1.0, < 12.1.4-h6>= 12.1.5, < 12.1.7
    First fixed release12.1.4-h612.1.7
  2. 11.2Approaching end of support
    Affected versions>= 11.2.0, < 11.2.4-h17>= 11.2.5, < 11.2.7-h14>= 11.2.8, < 11.2.10-h7>= 11.2.11, < 11.2.12
    First fixed release11.2.4-h1711.2.7-h1411.2.10-h711.2.12
  3. 11.1Approaching end of support
    Affected versions>= 11.1.0, < 11.1.4-h33>= 11.1.5, < 11.1.6-h32>= 11.1.7, < 11.1.7-h6>= 11.1.8, < 11.1.10-h25>= 11.1.11, < 11.1.13-h5>= 11.1.14, < 11.1.15
    First fixed release11.1.4-h3311.1.6-h3211.1.7-h611.1.10-h2511.1.13-h511.1.15
  4. 10.2End of life
    Affected versions>= 10.2.0, < 10.2.7-h34>= 10.2.8, < 10.2.10-h36>= 10.2.11, < 10.2.13-h21>= 10.2.14, < 10.2.16-h7>= 10.2.17, < 10.2.18-h6
    First fixed release10.2.7-h3410.2.10-h3610.2.13-h2110.2.16-h710.2.18-h6

Releases the vendor does not list are not affected.

Palo Alto Networks Prisma Access

Source: CVE-2026-0257

  1. 11.2
    Affected versions>= 11.2.0, < 11.2.7-h13
    First fixed release11.2.7-h13
  2. 10.2
    Affected versions>= 10.2.0, < 10.2.10-h36
    First fixed release10.2.10-h36

Releases the vendor does not list are not affected.

Remediation

Fix available

Vendor fix

  • PAN-OS 12.112.1.4-h6, 12.1.7
  • PAN-OS 11.211.2.4-h17, 11.2.7-h14, 11.2.10-h7, 11.2.12
  • PAN-OS 11.111.1.4-h33, 11.1.6-h32, 11.1.7-h6, 11.1.10-h25, 11.1.13-h5, 11.1.15
  • PAN-OS 10.210.2.7-h34, 10.2.10-h36, 10.2.13-h21, 10.2.16-h7, 10.2.18-h6
  • Prisma Access 11.211.2.7-h13
  • Prisma Access 10.210.2.10-h36

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

Version Minor Version Suggested Solution Cloud NGFW All No action needed. PAN-OS 12.1 12.1.5 through 12.1.6 Upgrade to 12.1.7 or later. 12.1.2 through 12.1.4-h* Upgrade to 12.1.4-h6 or 12.1.7 or later. PAN-OS 11.2 11.2.11 or later Upgrade to 11.2.12 or later.

Full text

11.2.8 through 11.2.10-h* Upgrade to 11.2.10-h7 or 11.2.12 or later. 11.2.5 through 11.2.7-h* Upgrade to 11.2.7-h14 or 11.2.12 or later. 11.2.0 through 11.2.4-h* Upgrade to 11.2.4-h17 or 11.2.12 or later. PAN-OS 11.1 11.1.14 or later Upgrade to 11.1.15 or later. 11.1.11 through 11.1.13-h* Upgrade to 11.1.13-h5 or 11.1.15 or later. 11.1.8 through 11.1.10-h* Upgrade to 11.1.10-h25 or 11.1.15 or later. 11.1.7 through 11.1.7-h* Upgrade to 11.1.7-h6 or 11.1.15 or later. 11.1.5 through 11.1.6-h* Upgrade to 11.1.6-h32 or 11.1.15 or later. 11.1.0 through 11.1.4-h* Upgrade to 11.1.4-h33 or 11.1.15 or later. PAN-OS 10.2 10.2.17 through 10.2.…

SourcePalo Alto Networks (CVE record)

Mitigation (vendor)

Customers can mitigate the risk of this issue by taking any of the following actions: * Use a dedicated certificate for Authentication Override cookies: Generate a new certificate exclusively for authentication override cookies and store it securely.

Full text

Do not reuse the portal or gateway certificate, and do not share this certificate with other features or users. * Disable Authentication Override: Uncheck the Authentication Override options (for generating and accepting cookies) in the GlobalProtect portal and gateway configuration.

SourcePalo Alto Networks (CVE record)

CISA KEV 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 due date:

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-0596

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Added to CISA KEV on 29 May 2026

Federal remediation due date: 1 Jun 2026

Known use in ransomware campaigns

The CISA required action is shown under Remediation.

96% probability of exploitation in the next 30 days (percentile 100%).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-0596Published 15 May 2026

Multiple vulnerabilities in Palo Alto Networks products

Remote arbitrary code executionPrivilege escalationRemote denial of serviceData confidentiality breachData integrity breachSecurity policy bypassRemote cross-site scripting (XSS)Server-side request forgery (SSRF)SQL injection (SQLi)

Summary

Multiple vulnerabilities have been discovered in Palo Alto Networks products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation, and remote denial of service.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:03 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Published by the source
  2. Added to CISA KEV
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

Vendor advisory

References

Palo Alto Networks · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: PAN-OS versions explained: release lines, maintenance releases and the -h1, -h2, -h3 suffixes

Related vulnerabilities

Other records affecting the same products, newest first.

  • CVE-2026-0301PAN-OS: Information Disclosure Vulnerability in URL FilteringHigh
  • CVE-2026-0280PAN-OS: IPv6 Firewall Policy BypassHigh
  • CVE-2026-0281PAN-OS: Information Disclosure Vulnerability in Management Web InterfaceHigh
  • CVE-2026-0283PAN-OS: Authentication Bypass Vulnerability in Large Scale VPN (LSVPN)High
  • CVE-2026-0284PAN-OS: XML Injection Vulnerability in Large Scale VPN (LSVPN)Critical

All PAN-OS vulnerabilitiesAll Palo Alto Networks vulnerabilities