Free practical cybersecurity guidance for organisations without a security team.
hello@actionsoncyber.com
Actions On Cyber logo
Contact
← Back to Vulnerability Briefs

Urgent: Security Flaw Found in Citrix NetScaler Could Allow Attacks

A serious security weakness has been found in Citrix NetScaler products that are used to manage network traffic and remote access. This flaw is actively being exploited by attackers and could allow them to disrupt services or gain unauthorised access. Small organisations using these products should act quickly to reduce risk.

05 October 2026

Reference: CVE-2026-88779

1. What is being reported?

Researchers and security agencies have identified a high-risk vulnerability in Citrix NetScaler ADC and Gateway devices. This flaw involves improper handling of memory operations, which attackers can exploit remotely to cause damage or take control. The issue affects specific versions of the software before certain updates were released.

2. What this means in plain English

If your organisation uses Citrix NetScaler to manage internet traffic or remote connections, this vulnerability could let attackers disrupt your services or access sensitive information. This could lead to downtime, data loss, or further security breaches. Because the flaw is actively exploited, it is important to address it promptly.

3. Could this affect a small business?

Small businesses and charities using Citrix NetScaler appliances or services with the affected software versions could be at risk, especially if these devices are exposed to the internet. Organisations not using these products or using fully updated versions are unlikely to be affected.

4. What to do now

  • Check if your organisation uses Citrix NetScaler ADC or Gateway products and identify the software version.
  • Contact your IT provider or software supplier immediately to confirm if your devices are affected.
  • Apply the latest security updates or patches from Citrix as soon as possible following their official instructions.
  • If updates are not available, follow recommended mitigations or consider discontinuing use of the affected product until it is secured.

5. Ask your IT provider

Can you confirm whether our Citrix NetScaler devices are running affected versions and have the latest security patches been applied to protect against CVE-2026-88779?

6. Bottom line

If you use Citrix NetScaler, act quickly to update or mitigate this serious vulnerability to keep your organisation safe.

Information based on CISA KEV, NVD, and multiple reputable security news reports.

Back to Vulnerability Briefs