N-able Mail Assure through April 2026 contains a design-level authorization flaw that allows an authenticated SMTP user to send outbound email using MAIL FROM addresses belonging to other tenants. When connecting to the SMTP TCP port and performing SMTP AUTH with valid credentials, the server accepts arbitrary sender domains without enforcing any domain-to-account binding. As a result, an attacker from any tenant can impersonate other tenant domains, producing messages that pass SPF and DMARC validation. NOTE: N-able's position is that the behavior is intended functionality of its shared SMTP relay architecture and that the service does not represent that it enforces per-tenant sender-domain binding.

N-able N-central contains a static code injection vulnerability that could allow for pre-authentication remote code execution.

Two security vulnerabilities within N-central were responsibly disclosed by a third party through our security disclosure program. We have issued a hotfix that you should apply immediately to help ensure your environments are protected. At this time, we have no confirmations that these vulnerabilities have been exploited in production environments, but unpatched systems remain at risk.

This hotfix includes security fixes for CVE-2026-86206 and CVE-2026-86207 which are high-CVSS-rated vulnerabilities that could allow an unauthorized party to bypass authentication controls and gain full access to the N-central platform.

What You Need to Do • N-central On-Premises Environments: We recommend upgrading to 2026.3 HF3 immediately. Hotfix link: 2026.3 HF3 Release Notes • N-central Hosted Environments: No action is needed on your part; your instances have already been patched and will be upgraded at a later time. Please note that this is a server-side hotfix and upgrading to 2026.3 HF3 will not require agent upgrades.

A vulnerability in the N-central internal API access control filter allows unauthorised access to internal APIs. This is fixed in N-central 2026.3 HF3 and 2026.4

An authentication bypass in N-central < 2026.3 HF 3 leads to authentication bypass in internal only APIs

vault token disclosure via unvalidated postMessage vulnerability in N-able PassPortal allows Authentication Abuse.

This issue affects the PassPortal browser extension: before 3.49.6.

Orgs have already been ransomwared, patch immediately

Copied from r/msp

As our investigation into the recent N-central security vulnerability continues, we are proactively expanding protections in response to ongoing monitoring of threat actors as they evolve their attack techniques.

This is not a duplicate of our previous communication. Hotfix 2 is required, even if you already applied the earlier hotfix. Hotfix 2 supersedes Hotfix 1 with additional hardening measures to further protect you and your customers.

What You Need to Do:

N-central On-Premises Environments: You must upgrade to 2026.3.1.10 immediately. Download here: https://status.n-able.com/2026/08/06/n-central-2026-3-hotfix-2-additional-mitigation-for-cve-2026-18577

N-central Hosted Environments: No action is required. We have already applied mitigations to your environment.

For More Information:

· Blog: https://www.n-able.com/blog/n-central-security-update-august-6-2026

· Support: https://me.n-able.com/s/

· CVE: https://www.cve.org/CVERecord?id=CVE-2026-18577

· Uptime: https://uptime.n-able.com/

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

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.

The N-central Software Probe < 2025.4 is vulnerable to Remote Code Execution via deserialization

N-central < 2025.4 is vulnerable to authentication bypass via path traversal

N-central versions < 2025.4 are vulnerable to multiple XML External Entities injection leading to information disclosure

N-central < 2025.4 can generate sessionIDs for unauthenticated users

This issue affects N-central: before 2025.4.

An Incorrect File Handling Permission bug exists on the N-central Windows Agent and Probe that, in the right circumstances, can allow a local low-level user to run commands with elevated permissions.

On N-central, it is possible for any authenticated user to read, write and modify syslog configuration across customers on an N-central server. This vulnerability is present in all deployments of N-central prior to 2025.2.

Improper Input Validation vulnerability in N-able N-central allows OS Command Injection.This issue affects N-central: before 2025.3.1.

Deserialization of Untrusted Data vulnerability in N-able N-central allows Local Execution of Code.This issue affects N-central: before 2025.3.1.

N-central is vulnerable to a path traversal that allows unintended access to the Apache Tomcat WEB-INF directory. Customer data is not exposed.

This vulnerability is present in all deployments of N-central prior to N-central 2024.6.

Ecosystem Agent version 4 < 4.1.5.2597 and Ecosystem Agent version 5 < 5.1.4.2473 did not properly validate SSL/TLS certificates, which could allow a malicious actor to perform a Man-in-the-Middle and intercept traffic between the agent and N-able servers from a privileged network position.

The N-central server is vulnerable to an authentication bypass of the user interface. This vulnerability is present in all deployments of N-central prior to 2024.2.

This vulnerability was discovered through internal N-central source code review and N-able has not observed any exploitation in the wild.

The N-central server is vulnerable to session rebinding of already authenticated users when using Entra SSO, which can lead to authentication bypass. This vulnerability is present in all Entra-supported deployments of N-central prior to 2024.3.

The affected AutomationManager.AgentService.exe application contains a TOCTOU race condition vulnerability that allows standard users to create a pseudo-symlink at C:\ProgramData\N-Able Technologies\AutomationManager\Temp, which could be leveraged by an attacker to manipulate the process into performing arbitrary file deletions. We recommend upgrading to version 2.91.0.0

An issue discovered in N-able N-central before 2023.6 and earlier allows attackers to gain escalated privileges via API calls.

The N-able PassPortal extension before 3.29.2 for Chrome inserts sensitive information into a log file.

BASupSrvcUpdater.exe in N-able Take Control Agent through 7.0.41.1141 before 7.0.43 has a TOCTOU Race Condition via a pseudo-symlink at %PROGRAMDATA%\GetSupportServiceN-Central\PushUpdates, leading to arbitrary file deletion.

An issue found in N-able Technologies N-central Server before 2023.4 allows a local attacker to execute arbitrary code via the monitoring function of the server.