What is CVE-2026-18577?
An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1
The record classifies CVE-2026-18577 under weakness class CWE-288. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 92 days ago.
Severity and exploitation probability
- CVSS v4.0 base score
- 8.2 — High (derived from score)
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 - EPSS (FIRST)
- 1.4% probability of exploitation in the next 30 days, higher than 71.3% of all scored CVEs
- CISA KEV
- Listed since 2026-08-03, federal remediation deadline 2026-08-06
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2026-08-02, last modified 2026-08-03
Is CVE-2026-18577 being exploited?
CISA added CVE-2026-18577 to the Known Exploited Vulnerabilities catalog on 2026-08-03, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-08-06 under BOD 22-01. It currently carries a trending score of 58 in the Threadlinqs vulnerability feed.
Affected products and versions
- N-able: N-central
How to fix CVE-2026-18577
Because CVE-2026-18577 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-08-06. No vendor patch reference has been recorded for CVE-2026-18577 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-18577
3 tracked threats in the Threadlinqs corpus reference CVE-2026-18577, either in the campaign’s CVE list or as an indicator on the campaign record.
- Multi-Stage Abuse of Legitimate Remote Access Tools (ConnectWise, N-Able, SimpleHelp, Datto RMM, GoTo) by Initial Access Brokers — HIGH · 2026-09-25
- N-able N-central Authentication Bypass Flaws (CVE-2026-18556, CVE-2026-18577) Actively Exploited for Admin Access and Cloudflare Tunnel Persistence — HIGH · 2026-08-08
- N-able N-central Authentication Bypass (CVE-2026-18577) Actively Exploited for Admin Takeover — CRITICAL · 2026-08-03
Sources
Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.