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CVE-2026-18556

HIGH 8.2 KNOWN EXPLOITED ALL-YEARS

Published 2026-08-01 · Last modified 2026-08-05 · N-able · NVD: Analyzed

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.

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-08-04. Patch or mitigate now.

Exploitation likelihood

7.9%chance of exploitation in 30 days · 95th percentile

● In CISA KEV (2026-08-04)○ Catalogued PoC◆ SSVC: exploitation active, automatable yes

Impact if exploited

8.2CVSS 4.0 · HIGH · CNA

  • ConfidentialityHigh
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ⚠Complexity: Needs a race window or specific setup
  • ✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors N Able

Products N Central

Weakness (CWE)

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

CVSS vector

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

References and research data (JSON)

Unverified PoC candidates

Catalogue matches for further research. These repositories have not been validated as working exploits.

1 candidate

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

  • VulnCheck KEV · 2026-08-01T00:00:00Z

    Source guidance: 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.

    Source ransomware assessment: Unknown

    VulnCheck KEV · CVE-2026-18556 · Updated 2026-08-01T00:00:00Z
  • VulnCheck KEV · 2026-08-01T00:00:00ZVulnCheck KEV · CVE-2026-18556
    VulnCheck KEV · CVE-2026-18556
  • VulnCheck KEV · 2026-08-04T00:00:00ZVulnCheck KEV · CVE-2026-18556
  • VulnCheck KEV · 2026-08-06T00:00:00ZVulnCheck KEV · CVE-2026-18556
  • VulnCheck KEV · 2026-08-07T00:00:00ZVulnCheck KEV · CVE-2026-18556
  • VulnCheck KEV · 2026-08-16T00:00:00ZVulnCheck KEV · CVE-2026-18556
  • VulnCheck KEV · 2026-09-06T00:00:00ZVulnCheck KEV · CVE-2026-18556
  • VulnCheck KEV · 2026-09-08T00:00:00ZVulnCheck KEV · CVE-2026-18556

Known Affected Software Configurations

VendorProductVersion range
N AbleN Central≤ 2026.1

All CVSS metrics

  • HIGH 8.2 v4.0 · CNA Primary
    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
  • HIGH 8.2 v4.0 · NVD Secondary
    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
  • HIGH 7.4 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS