CVE-2026-18556 — Authentication bypass using an alternate path or channel vulnerability in N-able

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

01What is this vulnerability?

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

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2026-08-04. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2026-08-01T20:16:37.157
• Last modified: 2026-08-05T05:16:46.967
• Added to CISA KEV: 2026-08-04

09References

• uptime.n-able.com — https://uptime.n-able.com/
• www.cisa.gov — https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-…
• www.n-able.com — https://www.n-able.com/blog/n-central-security-update-august-2-2026