NCSC-2026-0172

Vulnerability from csaf_ncscnl - Published: 2026-05-30 10:52 - Updated: 2026-05-30 10:52
Summary
Kwetsbaarheid verholpen in Palo Alto Networks PAN-OS en Prisma Access
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten: Palo Alto Networks heeft een kwetsbaarheid verholpen in de GlobalProtect portal- en gateway-componenten van PAN-OS.
Interpretaties: Een ongeauthenticeerde kwaadwillende kan de kwetsbaarheid misbruiken voor het opzetten van een VPN-verbinding. Zodoende krijgt de kwaadwillende toegang tot interne systemen die via de VPN-verbinding worden aangeboden. Systemen zijn alleen kwetsbaar wanneer (HTTPS-)certificaten worden hergebruikt en de optie "Generate cookie for authentication override" of "Accept cookie for authentication override" is ingeschakeld. Beveiligingsbedrijf Rapid7 meldt dat de kwetsbaarheid actief wordt misbruikt. Daarnaast is voor de kwetsbaarheid proof-of-conceptcode (PoC-code) publiekelijk beschikbaar. Gegeven de beschikbaarheid van de PoC-code, de algemene interesse van kwaadwillenden in edge-devices en de toegang die kwaadwillenden via deze kwetsbaarheid verkrijgen, verwacht het NCSC dat de schaal van misbruik de komende tijd toeneemt.
Oplossingen: Palo Alto Networks heeft beveiligingsupdates uitgebracht om de kwetsbaarheid te verhelpen. Het NCSC adviseert om deze updates zo spoedig mogelijk te installeren. Daarnaast adviseert het NCSC om kwetsbare omgevingen te controleren op aanwezigheid van de door Rapid7 gedeelde indicators-of-compromise (IOC's). Zie de bijgevoegde referenties voor meer informatie over de kwetsbaarheid en kwetsbare configuraties.
Kans: high
Schade: high
CWE-565: Reliance on Cookies without Validation and Integrity Checking
CVE-2026-0257

Authentication bypass vulnerabilities in Palo Alto Networks PAN-OS GlobalProtect portal and gateway allow unauthorized VPN access, while Panorama and Cloud NGFW remain unaffected.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-565 - Reliance on Cookies without Validation and Integrity Checking
Affected products
Product Identifier Version Remediation
vers:unknown/*
Palo Alto Networks / PAN-OS
 vers:unknown/*
vers:unknown/*
Palo Alto Networks / Prisma Access
 vers:unknown/*
vers:unknown/*
Palo Alto Networks / pan-os
 vers:unknown/*
vers:unknown/*
Palo Alto Networks / prisma_access
 vers:unknown/*
References
To clipboard 

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "Palo Alto Networks heeft een kwetsbaarheid verholpen in de GlobalProtect portal- en gateway-componenten van PAN-OS.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "Een ongeauthenticeerde kwaadwillende kan de kwetsbaarheid misbruiken voor het opzetten van een VPN-verbinding. Zodoende krijgt de kwaadwillende toegang tot interne systemen die via de VPN-verbinding worden aangeboden. Systemen zijn alleen kwetsbaar wanneer (HTTPS-)certificaten worden hergebruikt en de optie \"Generate cookie for authentication override\" of \"Accept cookie for authentication override\" is ingeschakeld.\n\nBeveiligingsbedrijf Rapid7 meldt dat de kwetsbaarheid actief wordt misbruikt. Daarnaast is voor de kwetsbaarheid proof-of-conceptcode (PoC-code) publiekelijk beschikbaar. Gegeven de beschikbaarheid van de PoC-code, de algemene interesse van kwaadwillenden in edge-devices en de toegang die kwaadwillenden via deze kwetsbaarheid verkrijgen, verwacht het NCSC dat de schaal van misbruik de komende tijd toeneemt.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "Palo Alto Networks heeft beveiligingsupdates uitgebracht om de kwetsbaarheid te verhelpen. Het NCSC adviseert om deze updates zo spoedig mogelijk te installeren. Daarnaast adviseert het NCSC om kwetsbare omgevingen te controleren op aanwezigheid van de door Rapid7 gedeelde indicators-of-compromise (IOC\u0027s). Zie de bijgevoegde referenties voor meer informatie over de kwetsbaarheid en kwetsbare configuraties.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Reliance on Cookies without Validation and Integrity Checking",
        "title": "CWE-565"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
      "name": "Nationaal Cyber Security Centrum",
      "namespace": "https://www.ncsc.nl/"
    },
    "references": [
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://security.paloaltonetworks.com/CVE-2026-0257"
      },
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://www.rapid7.com/blog/post/etr-rapid7-observed-exploitation-of-pan-os-globalprotect-authentication-bypass-vulnerability-cve-2026-0257/"
      }
    ],
    "title": "Kwetsbaarheid verholpen in Palo Alto Networks PAN-OS en Prisma Access",
    "tracking": {
      "current_release_date": "2026-05-30T10:52:02.477657Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
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      },
      "id": "NCSC-2026-0172",
      "initial_release_date": "2026-05-30T10:52:02.477657Z",
      "revision_history": [
        {
          "date": "2026-05-30T10:52:02.477657Z",
          "number": "1.0.0",
          "summary": "Initiele versie"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-1"
                }
              }
            ],
            "category": "product_name",
            "name": "PAN-OS"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
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                }
              }
            ],
            "category": "product_name",
            "name": "Prisma Access"
          },
          {
            "branches": [
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            "name": "prisma_access"
          }
        ],
        "category": "vendor",
        "name": "Palo Alto Networks"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-0257",
      "cwe": {
        "id": "CWE-565",
        "name": "Reliance on Cookies without Validation and Integrity Checking"
      },
      "notes": [
        {
          "category": "other",
          "text": "Reliance on Cookies without Validation and Integrity Checking",
          "title": "CWE-565"
        },
        {
          "category": "description",
          "text": "Authentication bypass vulnerabilities in Palo Alto Networks PAN-OS GlobalProtect portal and gateway allow unauthorized VPN access, while Panorama and Cloud NGFW remain unaffected.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "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",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
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          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
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      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-0257 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-0257.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
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            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-0257"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.