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CERT-FR advisory CERTFR-2026-AVI-1310 reports multiple vulnerabilities in Citrix products, based on Citrix security bulletins dated 13 October 2026. According to the advisory, some flaws allow an attacker to achieve arbitrary code execution, privilege escalation and remote denial of service. Other listed impacts are data integrity and con…
On 24 September 2026, GreyNoise observed a malicious actor using 149.104.78.141 to attempt pre-disclosure zero-day exploitation of a Citrix NetScaler Gateway on a Project Swarm participant sensor. No CVE-specific detections existed at the time, but behavioral detections labeled the activity malicious within seconds. The attempt failed to …
CISA added two Citrix NetScaler vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog based on evidence of active exploitation: CVE-2026-88771, an improper input validation flaw, and CVE-2026-88772, a memory buffer bounds restriction flaw. CISA describes these vulnerability types as frequent attack vectors for malicious cyb…
CISA added one vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog on 2026-10-04, citing evidence of active exploitation: CVE-2026-88779, an improper restriction of operations within the bounds of a memory buffer flaw in Citrix NetScaler. CISA describes this vulnerability type as a frequent attack vector for malicious cyber…
GreyNoise announced Project Swarm, a research initiative that opens its deception platform, the Global Observation Grid (5,000+ sensors in 80 countries, 500M+ sessions per day), to outside contributors. The stated aim is better visibility into attacks on network edge devices (firewalls, VPN gateways, routers, load balancers). These device…
Cloudflare published defensive guidance following the disclosure of actively exploited Citrix NetScaler vulnerabilities. CVE-2026-88771 allows unauthenticated command execution on affected appliances, including in the default configuration. CVE-2026-88772 affects configurations using DTLS. Citrix's September 27, 2026 bulletin reported obs…
Mandiant and GTIG attribute exploitation of the critical BeyondTrust Remote Support zero-day CVE-2026-102764 to Armory Castle (formerly tracked as UNC5221), a likely Chinese government-backed espionage group. BeyondTrust dates the first known exploitation to Aug. 29 and says it detected and contained the activity Sept. 28. Only a small nu…
CISA issued an alert on exploitation of critical zero-day vulnerabilities in Citrix NetScaler ADC and NetScaler Gateway, noting confirmed malicious activity involving at least some of them. The alert references Citrix bulletins for CVE-2026-107406, CVE-2026-88779 and CVE-2026-88771 through CVE-2026-88778. Because NetScaler updates can be …
