30 May 2026
Reference: CVE-2026-3055
1. What is being reported?
The vulnerability involves Citrix NetScaler ADC and NetScaler Gateway when they are set up as a SAML Identity Provider. Due to improper checking of input data, attackers could cause the device to read memory it shouldn’t, potentially leading to remote code execution or privilege escalation.
2. What this means in plain English
If exploited, this flaw could let attackers gain unauthorised access to your network or systems, possibly allowing them to steal data or disrupt operations. This is especially concerning for organisations using these Citrix devices to manage remote connections securely.
3. Could this affect a small business?
Small businesses using Citrix NetScaler ADC or Gateway configured as a SAML Identity Provider could be at risk. Those not using these specific devices or configurations are unlikely to be affected.
4. What to do now
- Check if your organisation uses Citrix NetScaler ADC or Gateway devices configured as a SAML Identity Provider.
- Contact your IT provider or Citrix support to confirm if your devices are vulnerable and if patches or updates are available.
- Apply any recommended security updates or patches from Citrix as soon as possible.
- Review remote access configurations and monitor for any unusual activity on your network.
5. Ask your IT provider
Can you confirm whether our Citrix NetScaler devices are configured as a SAML Identity Provider and if they are affected by CVE-2026-3055? What steps are being taken to protect us?
6. Bottom line
If you use Citrix NetScaler for remote access, act quickly to check and update your devices to prevent serious security risks.
Information based on CISA KEV, NVD, and reputable security reporting.