NCSC-2026-0275

Vulnerability from csaf_ncscnl - Published: 2026-08-03 07:04 - Updated: 2026-08-03 07:04
Summary
Kwetsbaarheden verholpen in N-able N-central
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: N-able heeft kwetsbaarheden verholpen in N-able N-central tot en met versie 2026.3.1.
Interpretaties: De kwetsbaarheden betreffen bypass van authenticatie in N-able N-central. In versies tot en met 2026.1 kan een aanvaller de authenticatiecontroles omzeilen door een alternatieve route binnen de applicatie te benutten. In versies tot en met 2026.3.1 is een onvolledige patch voor de kwetsbaarheid met kenmerk CVE-2026-18556 geïntroduceerd die authenticatieomzeiling en overname van accounts mogelijk maakt. Dit issue heeft kenmerk CVE-2026-18577 toegewezen gekregen. Hierdoor kan een aanvaller ongeautoriseerd toegang krijgen tot gebruikersaccounts en het systeem controleren. Alle implementaties die de genoemde versies gebruiken, zijn kwetsbaar. N-able meldt dat misbruik van de kwetsbaarheid is ontdekt en hierop gebruikers heeft geïnformeerd.
Oplossingen: N-able heeft Hotfix 2026.3.1.7 uitgebracht om de kwetsbaarheden te verhelpen en adviseert om de hotfix zo spoedig mogelijk in te zetten. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-287: Improper Authentication
CWE-288: Authentication Bypass Using an Alternate Path or Channel
CVE-2026-18577

An incomplete patch for CVE-2026-18556 in N-central versions up to 2026.3.1 results in authentication bypass and account takeover vulnerabilities.

CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Affected products
Product Identifier Version Remediation
vers:unknown/*
N-able / N-central
 vers:unknown/*
CVE-2026-18556

N-able N-central versions up to 2026.1 contain an authentication bypass vulnerability exploitable via an alternate path or channel.

CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Affected products
Product Identifier Version Remediation
vers:unknown/*
N-able / N-central
 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": "N-able heeft kwetsbaarheden verholpen in N-able N-central tot en met versie 2026.3.1.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "De kwetsbaarheden betreffen bypass van authenticatie in N-able N-central. In versies tot en met 2026.1 kan een aanvaller de authenticatiecontroles omzeilen door een alternatieve route binnen de applicatie te benutten.\n\nIn versies tot en met 2026.3.1 is een onvolledige patch voor de kwetsbaarheid met kenmerk CVE-2026-18556 ge\u00efntroduceerd die authenticatieomzeiling en overname van accounts mogelijk maakt. Dit issue heeft kenmerk CVE-2026-18577 toegewezen gekregen. Hierdoor kan een aanvaller ongeautoriseerd toegang krijgen tot gebruikersaccounts en het systeem controleren. Alle implementaties die de genoemde versies gebruiken, zijn kwetsbaar.\n\nN-able meldt dat misbruik van de kwetsbaarheid is ontdekt en hierop gebruikers heeft ge\u00efnformeerd.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "N-able heeft Hotfix 2026.3.1.7 uitgebracht om de kwetsbaarheden te verhelpen en adviseert om de hotfix zo spoedig mogelijk in te zetten. Zie bijgevoegde referenties voor meer informatie.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "medium",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Improper Authentication",
        "title": "CWE-287"
      },
      {
        "category": "general",
        "text": "Authentication Bypass Using an Alternate Path or Channel",
        "title": "CWE-288"
      }
    ],
    "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://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm"
      },
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://uptime.n-able.com/"
      }
    ],
    "title": "Kwetsbaarheden verholpen in N-able N-central",
    "tracking": {
      "current_release_date": "2026-08-03T07:04:48.429960Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
        }
      },
      "id": "NCSC-2026-0275",
      "initial_release_date": "2026-08-03T07:04:48.429960Z",
      "revision_history": [
        {
          "date": "2026-08-03T07:04:48.429960Z",
          "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"
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              }
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            "category": "product_name",
            "name": "N-central"
          }
        ],
        "category": "vendor",
        "name": "N-able"
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  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-18577",
      "cwe": {
        "id": "CWE-288",
        "name": "Authentication Bypass Using an Alternate Path or Channel"
      },
      "notes": [
        {
          "category": "other",
          "text": "Authentication Bypass Using an Alternate Path or Channel",
          "title": "CWE-288"
        },
        {
          "category": "description",
          "text": "An incomplete patch for CVE-2026-18556 in N-central versions up to 2026.3.1 results in authentication bypass and account takeover vulnerabilities.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L/E:A",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-18577 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-18577.json"
        }
      ],
      "title": "CVE-2026-18577"
    },
    {
      "cve": "CVE-2026-18556",
      "cwe": {
        "id": "CWE-288",
        "name": "Authentication Bypass Using an Alternate Path or Channel"
      },
      "notes": [
        {
          "category": "other",
          "text": "Authentication Bypass Using an Alternate Path or Channel",
          "title": "CWE-288"
        },
        {
          "category": "description",
          "text": "N-able N-central versions up to 2026.1 contain an authentication bypass vulnerability exploitable via an alternate path or channel.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/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:X/R:X/V:X/RE:X/U:X",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-18556 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-18556.json"
        }
      ],
      "title": "CVE-2026-18556"
    }
  ]
}



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