Vulnerability-Lookup

CVE-2026-18556 (GCVE-0-2026-18556)

Vulnerability from cvelistv5 – Published: 2026-08-01 19:59 – Updated: 2026-08-04 17:44

CISA KEVIntel

Title

Unauthenticated administrative account takeover

Summary

Authentication bypass using an alternate path or channel vulnerability in N-able N-central allows Authentication Bypass. This issue affects N-central: through 2026.1.

Severity

8.2 (High)


                        
                          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

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-288 - Authentication bypass using an alternate path or channel

Assigner

N-able

References

3 references

URL	Tags
https://uptime.n-able.com/
https://www.n-able.com/blog/n-central-security-up…	vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

1 product

Vendor	Product	Version
N-able	N-central	Affected: 0 , ≤ 2026.1 (custom)

Date Public

2026-08-01 19:56

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 8f341abd-5de9-4051-b7ad-7fce9c6482e0

Vulnerability ID: CVE-2026-18556

Status: Confirmed

Status Updated: 2026-08-04 00:00 UTC

Exploited: Yes

Timestamps

First Seen: 2026-08-04

Asserted: 2026-08-04

Scope

Notes: N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability | Affected: N-able / N-central | Description: N-able N-central contains an authentication bypass using an alternate path or channel that allows for authentication bypass. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-08-07 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://uptime.n-able.com/ ; https://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-18556

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details

Cwes	CWE-288
Feed	CISA Known Exploited Vulnerabilities Catalog
Product	N-central
Due Date	2026-08-07
Date Added	2026-08-04
Vendorproject	N-able
Vulnerabilityname	N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability
Knownransomwarecampaignuse	Unknown

References

CVE-2026-18556

Created: 2026-08-04 18:00 UTC | Updated: 2026-08-04 18:00 UTC

KEVIntel

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 4a07f7e0-6a49-4d0b-89bb-656bffcdd75f

Vulnerability ID: CVE-2026-18556

Status: Confirmed

Status Updated: 2026-08-01 13:51 UTC

Exploited: Yes

Timestamps

First Seen: 2026-08-01

Asserted: 2026-08-01

Scope

Notes: Unauthenticated administrative account takeover | Affected: N-able / N-central | CVSS: 8.2 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details

Feed	KEVIntel (kevintel.com)
Title	Unauthenticated administrative account takeover
Vendor	N-able
Product	N-central
Added Date	2026-08-01T13:51:00.000Z
Cvss Score	8.2
Epss Score	None
Cvss Severity	HIGH
Epss Percentile	None
Used In Malware	unknown
Ahead Of Cisa Kev	None
Not Yet In Cisa Kev	True

References

Created: 2026-08-02 14:00 UTC | Updated: 2026-08-02 14:00 UTC

Show details on NVD website

JSON

To clipboard

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GHSA-FFFV-7W63-P3XW

Vulnerability from github – Published: 2026-08-01 21:31 – Updated: 2026-08-04 15:32

Details

Authentication bypass using an alternate path or channel vulnerability in N-able N-central allows Authentication Bypass.

This issue affects N-central: through 2026.1.

Severity

7.4 (High)


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

8.2 (High)


                  
                    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

Show details on source website

JSON

To clipboard

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  ],
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  "modified": "2026-08-04T15:32:16Z",
  "published": "2026-08-01T21:31:27Z",
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    },
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      "type": "CVSS_V4"
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}

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

Known affected 1 product

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

Known affected 1 product

Product	Identifier	Version	Remediation
vers:unknown/* N-able / N-central		vers:unknown/*

References

4 references

URL	Category
https://documentation.n-able.com/N-central/Releas…	external
https://uptime.n-able.com/	external
https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-…	self
https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-…	self

JSON

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"
                }
              }
            ],
            "category": "product_name",
            "name": "N-central"
          }
        ],
        "category": "vendor",
        "name": "N-able"
      }
    ]
  },
  "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"
        }
      ],
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        ]
      },
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          "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"
    }
  ]
}

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-18556 (GCVE-0-2026-18556)

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Vendor Report Successful Exploitation Confidence: 80% Source: cisa-kev

Details

References

KEVIntel

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Public Report Successful Exploitation Confidence: 70% Source: kevintel

Details

References

GHSA-FFFV-7W63-P3XW

NCSC-2026-0275

Tags

Sightings

Nomenclature