Serial number:AV26-1026
Date:October 9, 2026

As of October 8, 2026, SmarterTools is affected by a vulnerability in the following product:

• SmarterMail
  • Prior to Build 9777

The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available.

• SmarterMail Release Notes
• Download SmarterMail

Serial number:AV26-1017
Date:October 7, 2026
Updated: October 9, 2026

As of October 6, 2026, SonicWall is affected by vulnerabilities in the following product:

• SMA1000 Models - 6210, 7210, 8200v
  • Version 12.4.3-03670 (platform-hotfix) and prior
  • Version 12.5.0-03082 (platform-hotfix) and prior

Update 1

Open source reporting indicates that CVE-2026-102255 is being exploited in the wild.

The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available.

• SonicWall SMA1000 Series Appliances Affected By Multiple Vulnerabilities
• SonicWall Security Advisory

Number: AL26-024
Date: September 27, 2026
Update: October 9, 2026

Audience

This Alert is intended for IT professionals and managers.

Purpose

An Alert is used to raise awareness of a recently identified cyber threat that may impact cyber information assets, and to provide additional detection and mitigation advice to recipients. The Canadian Centre for Cyber Security ("Cyber Centre") is also available to provide additional assistance regarding the content of this Alert to recipients as requested.

Details

The Canadian Centre for Cyber Security (Cyber Centre) is aware of critical vulnerabilities affecting Citrix NetScaler ADC and NetScaler Gateway appliances. In response to the vendor security bulletin ^Footnote1 and blog ^Footnote2 released on September 27, 2026, the Cyber Centre is issuing this alert to raise awareness of the vulnerabilities and associated reports of active exploitation.

Tracked as CVE-2026-88771 ^Footnote3, this vulnerability is an Improper Input Validation vulnerability (CWE-20) ^Footnote4. The vulnerability may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable NetScaler appliance. Successful exploitation could result in complete compromise of the appliance, unauthorized access to applications and services, credential theft, lateral movement, and further compromise of internal systems.

Tracked as CVE-2026-88772 ^Footnote5, this vulnerability is a Buffer Overflow vulnerability (CWE-119) ^Footnote6. Successful exploitation may allow arbitrary code execution, memory corruption, denial of service conditions, or other unintended behaviour on affected appliances.

Reports indicate that these vulnerabilities are being exploited and have been observed across multiple Citrix customer environments worldwide, although the full extent of this activity remains unknown at this time.

Beginning of Update 1

On October 2, 2026, Citrix published guidance ^Footnote10 regarding a newly identified issue affecting NetScaler ADC and NetScaler Gateway deployments configured to use SAML authentication. According to Citrix, a remote attacker may be able to trigger system instability, resulting in denial-of-service conditions, repeated appliance reboots, and potentially further exploitation.

This issue is understood to be distinct from the vulnerabilities CVE-2026-88771 and CVE-2026-88772 described in the original alert.

The updates released to address CVE-2026-88771 and CVE-2026-88772 do not remediate this newly identified issue. Organizations using SAML authentication on NetScaler appliances should review their deployments, monitor for signs of abnormal activity, and follow the mitigation guidance provided by Citrix^Footnote10.

Additionally, organizations should be aware that patching alone may not fully remediate systems previously compromised through CVE-2026-88771 and/or CVE-2026-88772. If exploitation was successful, persistence mechanisms may remain on affected appliances even after the updates are applied. Organizations are strongly encouraged to run the NetScaler Console Indicators of Compromise (IOC) detection tool^Footnote11 to assess whether compromise has occurred and to contact Citrix for further instructions and remediation guidance.

End of Update 1

Beginning of Update 2

Another critical vulnerability has been discovered in Citrix NetScaler ADC and Citrix NetScaler Gateway environments configured as SAML Service Providers (SPs) or Identity Providers (IdPs)^{Footnote12Footnote13}.

In response to the Citrix security bulletin released on October 8, 2026, the Cyber Centre issued AV26-1023 on October 9, 2026^Footnote14.

Tracked as CVE-2026-107406^Footnote15, this vulnerability is a memory overflow vulnerability (CWE-119)^Footnote6 leading to Denial of Service and potentially Remote Code Execution. Previous patches for the earlier vulnerabilities are insufficient to address this latest issue.

The Cyber Centre strongly recommends that affected organizations review the Citrix security bulletin^Footnote12 and update impacted NetScaler instances to the recommended versions as soon as possible.

End of Update 2

Suggested actions

Organizations should review the Citrix security bulletin ^Footnote1 to determine whether their deployments are affected, prioritize remediation of Internet-facing systems, and investigate for signs of compromise, particularly where evidence of suspicious activity predates the release of vendor fixes

The Cyber Centre also recommends that organizations:

• contact Citrix or their authorized support provider as soon as possible to obtain the latest security guidance and patch availability information
• Preserve forensic evidence before shutting down, rebooting, patching, rebuilding, or otherwise modifying affected appliances, where feasible.
• Preserve appliance logs, remote syslog records, and NetScaler Console logs.
• Collect support bundles and other diagnostic information that may assist future investigations.
• Review running processes and active network connections for suspicious or unexplained activity.
• Examine startup scripts, scheduled tasks, web application directories, and crash dump locations for unauthorized modifications or indicators of persistence.
• Preserve suspicious files and configurations before changing or removing them.
• Correlate findings with firewall, DNS, authentication, endpoint, and other supporting telemetry sources.
• Investigate unexpected outbound connections, unusual administrative access, and suspicious activity on connected systems.
• Review the attached list of indicators of compromise and investigate to find matching patterns.
• Follow Citrix guidance for suspected compromises, including isolation of affected appliances and assessment of credential exposure ^Footnote7.
• Conduct an organization-specific risk assessment based on the criticality of affected NetScaler deployments, any suspicious findings, and the limited information currently available.
• Where operationally feasible and justified by the organization's risk assessment, consider temporarily disabling or shutting down Internet-facing NetScaler appliances until vendor guidance and security updates become available; organizations should carefully weigh the cybersecurity risks of continued operation against the operational and business impacts of service disruption before taking this action.
• Prepare to reset credentials, invalidate active sessions, and replace certificates if compromise is suspected
• Be prepared to rebuild or replace compromised appliances from trusted software and known-good configurations.

Note: Organizations operating Common Criteria ^Footnote8 evaluated configurations should review Citrix's advisory ^Footnote1 and apply the recommended updates in accordance with their change management and certification requirements.

In addition, the Cyber Centre strongly recommends that organizations review and implement the Cyber Centre’s Top 10 IT Security Actions ^Footnote9.

• Consolidate, monitor, and defend Internet gateways
• Patch operating systems and applications
• Harden operating systems and applications
• Isolate web-facing applications

Should activity matching the content of this alert be discovered, recipients are encouraged to report via My Cyber Portal, or email contact@cyber.gc.ca.

References

Serial Number: AV26-1024
Date: October 9, 2026

As of October 8, 2026, MongoDB is affected by vulnerabilities in the following products:

• Go Driver
  • Prior to 2.9.0
  • Prior to 2.9.2
• libmongocrypt
  • Prior to 1.20.5

The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available.

• Duplicate masterKey field re-parses into the same KEK
• Reject int32 length overflow in bsoncore.valueLength
• Reject BSON lengths below the 5-byte minimum before slicing
• MongoDB Alerts

Serial number:AV26-1025
Date:October 9, 2026

As of October 8, 2026, Hewlett Packard Enterprise is affected by vulnerabilities in the following products:

• HPE Intelligent Management Center (iMC)
  • Prior to 7.3 E0713
• HPE Intelligent Assurance FAS/PDO
  • Version v4.2.17 and prior

The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available.

• HPESBNW05157 rev.1 - HPE Intelligent Management Center (iMC), Remote Authentication Bypass Vulnerability
• HPESBNW05165 rev. 1 - Multiple Vulnerabilities in HPE Telco Intelligent Assurance
• HPE Security Bulletin Library

Serial Number: AV26-1023
Date: October 9, 2026

• NetScaler ADC and NetScaler Gateway
  • Prior to 13.1-64.29
  • Prior to 14.1-73.46
• NetScaler ADC FIPS
  • Prior to 14.1-73.46 FIPS
  • Prior to 13.1-37.283 FIPS & NDcPP

The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available.

• Citrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-107406
• Citrix Security Advisories