CVE-2026-18577KEV · OVERDUECWE-288

N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability

High · published August 3, 2026

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.1. It is confirmed in active exploitation. It sits in the 96.7th percentile for exploit probability.

79
days past CISA
deadline
CVSS v3.1
8.1
EPSS
15%
Percentile
96.7
In the wild
Confirmed
What it is

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

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.14622 · 96.7th percentile
Weakness
CWE-288 · Authentication Bypass Using an Alternate Path or Channel
Published
2026-08-03T03:16Z
KEV added
2026-08-03 · due 2026-08-06
Affected products (2)
ProductVersionsFixed in
n-able/n-central< 2026.32026.3
n-able/n-centralall versions—
References (5)
https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm · a5532a13-c4dd-4202-bef1-e0b8f2f8d12bhttps://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577/ · a5532a13-c4dd-4202-bef1-e0b8f2f8d12bhttps://www.cve.org/CVERecord?id=CVE-2026-18556 · a5532a13-c4dd-4202-bef1-e0b8f2f8d12bhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-18577 · 134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.n-able.com/blog/n-central-security-update-august-2-2026 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 25 SEP 03:24Z
    EPSS moved 54% → 15%
    epss
  • 28 AUG 06:32Z
    EPSS moved 6% → 54%
    epss
  • 02 AUG 22:06Z
    Incomplete patch leads to administrative account takeover
    cvelistv5