CVE-2026-18556
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
7.4
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS — probability of exploitation (30 days)
40.2%
98.6th percentile
CISA KEV
Listed
Added 2026-08-04 · patch by 2026-08-07
Weakness / dates
CWE-288
Published 2026-08-01 · modified 2026-08-05
CVSS breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
| Attack Vector | N | Network |
| Attack Complexity | H | High |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | N | None |
Timeline
- 2026-08-01 — Published (NVD)
- 2026-08-04 — Added to CISA KEV (actively exploited)
- 2026-08-07 — CISA patch-by deadline
- 2026-08-05 — Last modified (NVD)
Description
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.