Citrix
CISA orders feds to patch exploited Citrix flaws by Wednesday
The Cybersecurity and Infrastructure Security Agency (CISA) has ordered U.S. government agencies over the weekend to secure their systems against attacks exploiting two critical Citrix NetScaler vulnerabilities. Citrix released security updates to address the flaws (tracked as CVE-2026-88771 and CVE-2026-88772) days after national cybersecurity agencies, IT suppliers, and security teams began privately contacting Citrix customers […]
Citrix confirms two NetScaler RCE zero-days exploited in attacks
Citrix has confirmed that two critical NetScaler remote code execution vulnerabilities, tracked as CVE-2026-88771 and CVE-2026-88772, are being exploited in attacks and that it has released security updates to fix the flaws. The vulnerabilities are the same zero-days that cybersecurity researchers, IT providers, and national cybersecurity agencies began privately warning organizations about over the weekend. […]
Critical Citrix NetScaler auth bypass now leveraged in attacks
Attackers have begun targeting a critical-severity Citrix NetScaler flaw in the wild, according to vulnerability intelligence company Previdian. Tracked as CVE-2026-19490, this security flaw can allow unprivileged threat actors to bypass authentication remotely when the NetScaler appliance is configured as an AAA virtual server or as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy), depending […]
CISA orders feds to patch Citrix NetScaler RCE flaw by Saturday
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has ordered government agencies to patch their Citrix NetScaler appliances against an actively exploited vulnerability by Saturday. Tracked as CVE-2026-8452, this high-severity security flaw stems from a memory overflow weakness affecting NetScaler ADC and NetScaler Gateway appliances configured with Gateway VPN or AAA (Authentication, Authorization, and Auditing) virtual […]
Citrix urges admins to patch new NetScaler flaws as soon as possible
Citrix has warned customers to immediately secure their systems against two vulnerabilities affecting NetScaler Gateway secure remote access solutions and NetScaler ADC networking appliances. The most severe of the two, tracked as CVE-2026-19490, can allow remote attackers without privileges to bypass authentication when the appliance is configured as an AAA virtual server or as a Gateway […]
CISA orders feds to patch actively exploited Citrix flaw by Thursday
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) ordered government agencies to patch their Citrix NetScaler appliances against an actively exploited vulnerability by Thursday. Multiple cybersecurity companies flagged the flaw (CVE-2026-3055) as posing an increased risk of exploitation after Citrix released security updates on March 23, noting a technical resemblance to the widely exploited ‘CitrixBleed’ and ‘CitrixBleed2’ security issues. […]
Critical Citrix NetScaler memory flaw actively exploited in attacks
Hackers are exploiting a critical severity vulnerability, tracked as CVE-2026-3055, in Citrix NetScaler ADC and NetScaler Gateway appliances to obtain sensitive data. Citrix initially disclosed CVE-2026-3055 in a security bulletin on March 23, alongside a high-severity race condition flaw tracked as CVE-2026-4368. The issue impacts versions of the two products before 14.1-60.58, versions older than 13.1-62.23, and those older than […]
Citrix urges admins to patch NetScaler flaws as soon as possible
Citrix has patched two vulnerabilities affecting NetScaler ADC networking appliances and NetScaler Gateway secure remote access solutions, one of which is very similar to the CitrixBleed and CitrixBleed2 flaws exploited in zero-day attacks in recent years. The critical security bug (tracked as CVE-2026-3055) stems from insufficient input validation, which can lead to a memory overread on Citrix […]
Wave of Citrix NetScaler scans use thousands of residential proxies
A coordinated reconnaissance campaign targeting Citrix NetScaler infrastructure over the past week used tens of thousands of residential proxies to discover login panels. The activity was observed between January 28 and February 2, and it also focused on enumerating versions of the product, indicating an organized discovery effort. Threat monitoring platform GreyNoise traced the source of the […]
Hackers exploited Citrix, Cisco ISE flaws in zero-day attacks
An advanced threat actor exploited the critical vulnerabilities “Citrix Bleed 2″ (CVE-2025-5777) in NetScaler ADC and Gateway, and CVE-2025-20337 affecting Cisco Identity Service Engine (ISE) as zero-days to deploy custom malware. Amazon’s threat intelligence team, analyzing “MadPot” honeypot data, found that hackers leveraged the two security issues before the security issues were disclosed publicly and patches became […]