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

Vulnerability from cvelistv5 – Published: 2026-08-02 22:06 – Updated: 2026-08-04 13:32
VLAI CISA KEVIntel
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 (v2.0.3)
CWE
  • CWE-288 - Authentication bypass using an alternate path or channel
Assigner
References
Impacted products
Vendor Product Version
N-able N-central Affected: 0 , ≤ 2026.3 (custom)
Unaffected: 2026.3.1.7 (custom)
Create a notification for this product.
Date Public
2026-08-02 21:44
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 2038f5ab-2fba-4a37-b761-3d116633c805

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
Created: 2026-08-03 20:00 UTC | Updated: 2026-08-03 20:00 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 263fb9e0-a398-4100-81af-047d3707fdcc

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
Notes: Incomplete patch leads to administrative account takeover | Affected: N-able / N-central | CVSS: 8.2 (HIGH) | EPSS: 0.01477 | Used in malware: unknown | Not yet in CISA KEV: False
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
To clipboard 

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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.
  • 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.


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