Vulnerability-Lookup

CVE-2026-18577 (GCVE-0-2026-18577)

Vulnerability from cvelistv5 – Published: 2026-08-02 22:06 – Updated: 2026-08-04 13:32

CISA Previdian

Title

Incomplete patch leads to administrative account takeover

Summary

An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L/E:A

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-04 03:56 UTC

CWE

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

Assigner

N-able mitre root

References

5 references

URL	Tags
https://documentation.n-able.com/N-central/Releas…
https://status.n-able.com/2026/08/02/n-central-20…
https://www.cve.org/CVERecord?id=CVE-2026-18556
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource
https://www.n-able.com/blog/n-central-security-up…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
N-able	N-central	Affected: 0 , ≤ 2026.3 (custom) Unaffected: 2026.3.1.7 (custom)	guessed

Date Public

2026-08-02 21:44

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: a013613c-01b8-42e9-ab38-5ae39e63141e

Vulnerability ID: CVE-2026-18577

Status: Confirmed

Status Updated: 2026-08-03 00:00 UTC

Exploited: Yes

Timestamps

First Seen: 2026-08-03

Asserted: 2026-08-03

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 allows for authentication bypass and account takeover in N-central. This vulnerability is the result of an incomplete patch for CVE-2026-18556. | 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: 2026-08-06 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm ; 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-2026-18577

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	2026-08-06
Date Added	2026-08-03
Vendorproject	N-able
Vulnerabilityname	N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability
Knownransomwarecampaignuse	Unknown

References

CVE-2026-18577

Created: 2026-08-03 20:00 UTC | Updated: 2026-08-03 20:00 UTC

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 5ce14e1c-ac05-49ca-81bc-1978117d0c8b

Vulnerability ID: CVE-2026-18577

Status: Confirmed

Status Updated: 2026-08-03 18:55 UTC

Exploited: Yes

Timestamps

First Seen: 2026-08-03

Asserted: 2026-08-03

Scope

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details

Feed	KEVIntel (kevintel.com)
Title	Incomplete patch leads to administrative account takeover
Vendor	N-able
Product	N-central
Added Date	2026-08-03T18:55:09.067Z
Cvss Score	8.2
Epss Score	0.01477
Cvss Severity	HIGH
Epss Percentile	0.7132
Used In Malware	unknown
Ahead Of Cisa Kev	None
Not Yet In Cisa Kev	False

References

Created: 2026-08-03 20:00 UTC | Updated: 2026-08-03 20:00 UTC

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-18577

Vulnerability from fkie_nvd - Published: 2026-08-02 23:16 - Updated: 2026-08-04 14:27

CISA Previdian

Severity

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

Summary

An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1

References

URL	Tags
a5532a13-c4dd-4202-bef1-e0b8f2f8d12b	https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm	Patch, Release Notes
a5532a13-c4dd-4202-bef1-e0b8f2f8d12b	https://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577/	Release Notes
a5532a13-c4dd-4202-bef1-e0b8f2f8d12b	https://www.cve.org/CVERecord?id=CVE-2026-18556	VDB Entry
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-18577	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	*
	n-able	n-central	2026.3

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "N-central",
          "vendor": "N-able",
          "versions": [
            {
              "lessThanOrEqual": "2026.3",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "2026.3.1.7",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "a5532a13-c4dd-4202-bef1-e0b8f2f8d12b"
    }
  ],
  "cisaActionDue": "2026-08-06",
  "cisaExploitAdd": "2026-08-03",
  "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": "6CEC2750-AFFB-40A4-97E0-88BDAC106F5E",
              "versionEndExcluding": "2026.3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:n-able:n-central:2026.3:-:*:*:*:*:*:*",
              "matchCriteriaId": "EB21160B-DDC4-4F70-A703-E313DED8CAF2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1"
    }
  ],
  "id": "CVE-2026-18577",
  "lastModified": "2026-08-04T14:27:12.530",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "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:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9,
        "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": "ATTACKED",
          "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": "LOW",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
          "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:L/SI:L/SA:L/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: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-2026-18577",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-04T03:56:18.454615Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-02T23:16:26.210",
  "references": [
    {
      "source": "a5532a13-c4dd-4202-bef1-e0b8f2f8d12b",
      "tags": [
        "Patch",
        "Release Notes"
      ],
      "url": "https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm"
    },
    {
      "source": "a5532a13-c4dd-4202-bef1-e0b8f2f8d12b",
      "tags": [
        "Release Notes"
      ],
      "url": "https://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577/"
    },
    {
      "source": "a5532a13-c4dd-4202-bef1-e0b8f2f8d12b",
      "tags": [
        "VDB Entry"
      ],
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-18556"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-18577"
    },
    {
      "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-QGCM-97X5-6Q8Q

Vulnerability from github – Published: 2026-08-03 00:30 – Updated: 2026-08-04 15:32

Details

An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1

Severity

8.1 (High)


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

8.2 (High)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-18577"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-288"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-02T23:16:26Z",
    "severity": "HIGH"
  },
  "details": "An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1",
  "id": "GHSA-qgcm-97x5-6q8q",
  "modified": "2026-08-04T15:32:16Z",
  "published": "2026-08-03T00:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18577"
    },
    {
      "type": "WEB",
      "url": "https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm"
    },
    {
      "type": "WEB",
      "url": "https://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-18577"
    },
    {
      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=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:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/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-2026-18577.

CVE-2026-18577

N-able N-central versions through 2026.3.1 contain an authentication bypass vulnerability due to an incomplete patch for CVE-2026-18556, enabling potential account takeover.

8.1 (High)


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

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-2026-18577 (GCVE-0-2026-18577)

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

FKIE_CVE-2026-18577

GHSA-QGCM-97X5-6Q8Q

NCSC-2026-0275

Tags

Sightings

Nomenclature

Related by attack behaviour