Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-08-01 19:59 – Updated: 2026-08-05 03:56

CISA Previdian

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-08-04 00:00 UTC

CWE

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

Assigner

N-able mitre root

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	CPE status
N-able	N-central	Affected: 0 , ≤ 2026.1 (custom)	guessed

Date Public

2026-08-01 19:56

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 4cdc9e94-fa75-4c6c-b085-725134e774e1

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

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: c7348c25-7f52-4a7b-aceb-f7f22bc17056

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

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        "assignerOrgId": "a5532a13-c4dd-4202-bef1-e0b8f2f8d12b",
        "assignerShortName": "N-able",
        "cveId": "CVE-2026-18556",
        "datePublished": "2026-08-01T19:59:30.913Z",
        "dateReserved": "2026-08-01T11:54:51.376Z",
        "dateUpdated": "2026-08-05T03:56:07.447Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

CNVD-2026-31828

Vulnerability from cnvd - Published: 2026-08-12

Title

N-able N-central授权问题漏洞

Description

N-able n-central是加拿大N-able公司的一款远程监控与管理系统。 N-able N-central 2026.1及之前版本存在安全漏洞。攻击者可利用该漏洞导致身份验证绕过。

Severity

高

Formal description

厂商尚未提供漏洞修复方案，请关注厂商主页更新： https://uptime.n-able.com/

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-18556

Impacted products

Name
N-able N-central <=2026.1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-18556",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-18556"
    }
  },
  "description": "N-able n-central\u662f\u52a0\u62ff\u5927N-able\u516c\u53f8\u7684\u4e00\u6b3e\u8fdc\u7a0b\u76d1\u63a7\u4e0e\u7ba1\u7406\u7cfb\u7edf\u3002\n\nN-able N-central 2026.1\u53ca\u4e4b\u524d\u7248\u672c\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u8eab\u4efd\u9a8c\u8bc1\u7ed5\u8fc7\u3002",
  "formalWay": "\u5382\u5546\u5c1a\u672a\u63d0\u4f9b\u6f0f\u6d1e\u4fee\u590d\u65b9\u6848\uff0c\u8bf7\u5173\u6ce8\u5382\u5546\u4e3b\u9875\u66f4\u65b0\uff1a\r\nhttps://uptime.n-able.com/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-31828",
  "openTime": "2026-08-12",
  "products": {
    "product": "N-able N-central \u003c=2026.1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-18556",
  "serverity": "\u9ad8",
  "submitTime": "2026-08-06",
  "title": "N-able N-central\u6388\u6743\u95ee\u9898\u6f0f\u6d1e"
}

FKIE_CVE-2026-18556

Vulnerability from fkie_nvd - Published: 2026-08-01 20:16 - Updated: 2026-08-05 05:16

CISA Previdian

Severity

7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

References

URL	Tags
a5532a13-c4dd-4202-bef1-e0b8f2f8d12b	https://uptime.n-able.com/	Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-18556	US Government Resource
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.n-able.com/blog/n-central-security-update-august-2-2026	Vendor Advisory

Impacted products

	Vendor	Product	Version
	n-able	n-central	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "N-central",
          "vendor": "N-able",
          "versions": [
            {
              "lessThanOrEqual": "2026.1",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "a5532a13-c4dd-4202-bef1-e0b8f2f8d12b"
    }
  ],
  "cisaActionDue": "2026-08-07",
  "cisaExploitAdd": "2026-08-04",
  "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (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\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "cisaVulnerabilityName": "N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:n-able:n-central:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4BC10DA8-8B50-4BCA-A302-810F4E3CD4CB",
              "versionEndIncluding": "2026.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Authentication bypass using an alternate path or channel vulnerability in N-able N-central allows Authentication Bypass.\n\nThis issue affects N-central: through 2026.1."
    }
  ],
  "id": "CVE-2026-18556",
  "lastModified": "2026-08-05T05:16:46.967",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "a5532a13-c4dd-4202-bef1-e0b8f2f8d12b",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-18556",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-04T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-01T20:16:37.157",
  "references": [
    {
      "source": "a5532a13-c4dd-4202-bef1-e0b8f2f8d12b",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://uptime.n-able.com/"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-18556"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.n-able.com/blog/n-central-security-update-august-2-2026"
    }
  ],
  "sourceIdentifier": "a5532a13-c4dd-4202-bef1-e0b8f2f8d12b",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-288"
        }
      ],
      "source": "a5532a13-c4dd-4202-bef1-e0b8f2f8d12b",
      "type": "Secondary"
    }
  ]
}

GHSA-FFFV-7W63-P3XW

Vulnerability from github – Published: 2026-08-01 21:31 – Updated: 2026-08-04 21:30

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

{
  "affected": [],
  "aliases": [
    "CVE-2026-18556"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-288"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-01T20:16:37Z",
    "severity": "HIGH"
  },
  "details": "Authentication bypass using an alternate path or channel vulnerability in N-able N-central allows Authentication Bypass.\n\nThis issue affects N-central: through 2026.1.",
  "id": "GHSA-fffv-7w63-p3xw",
  "modified": "2026-08-04T21:30:25Z",
  "published": "2026-08-01T21:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18556"
    },
    {
      "type": "WEB",
      "url": "https://uptime.n-able.com"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-18556"
    },
    {
      "type": "WEB",
      "url": "https://www.n-able.com/blog/n-central-security-update-august-2-2026"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

NCSC-2026-0275

Vulnerability from csaf_ncscnl - Published: 2026-08-03 07:04 - Updated: 2026-08-07 07:20

Summary

Kwetsbaarheden verholpen in N-able N-central

Scope

2 vulnerabilities in this advisory, including CVE-2026-18556.

CVE-2026-18556

N-able N-central versions through 2026.1 contain an authentication bypass vulnerability exploitable via an alternate path or channel, requiring vendor mitigations and adherence to CISA's BOD 26-04 guidance.

7.4 (High)


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

Known affected: 1 product

Open the full advisory

WID-SEC-W-2026-2621

Vulnerability from csaf_certbund - Published: 2026-08-02 22:00 - Updated: 2026-08-02 22:00

Summary

N-able N-Central: Mehrere Schwachstellen ermöglichen Umgehen von Sicherheitsvorkehrungen

Severity

Mittel

Scope

2 vulnerabilities in this advisory, including CVE-2026-18556.

CVE-2026-18556

Known affected: 1 product

Open the full advisory

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Public Report Successful Exploitation Confidence: 70% Source: kevintel

Details

References

CNVD-2026-31828

FKIE_CVE-2026-18556

GHSA-FFFV-7W63-P3XW

NCSC-2026-0275

WID-SEC-W-2026-2621

Tags

Sightings

Nomenclature

Related by attack behaviour