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The Canadian Centre for Cyber Security released a daily digest of 10 security advisories highlighting critical vulnerabilities across multiple vendors. Notably, vulnerabilities in Fortinet FortiClientEMS (CVE-2026-21643) and Citrix NetScaler (CVE-2026-3055) are currently being exploited in the wild, requiring immediate patching and potential incident response actions if compromise is suspected.
CISA has added CVE-2026-3055, an actively exploited out-of-bounds read vulnerability affecting Citrix NetScaler, to its Known Exploited Vulnerabilities (KEV) Catalog. The agency mandates federal remediation under BOD 22-01 and strongly urges all organizations to prioritize patching to reduce exposure to cyberattacks.
A second memory overread vulnerability has been identified in Citrix NetScaler appliances under CVE-2026-3055, affecting the '/wsfed/passive?wctx' endpoint. By sending a specially crafted GET request with an empty 'wctx' parameter, attackers can force the appliance to leak sensitive memory, including administrative session IDs, via the 'NSC_TASS' cookie. Active in-the-wild exploitation has been observed since late March.
The NCSC has issued an alert regarding two vulnerabilities in customer-managed Citrix NetScaler ADC and Gateway appliances. CVE-2026-3055 allows for a memory overread in SAML IDP configurations, while CVE-2026-4368 causes user session mixups via a race condition in Gateway or AAA virtual server configurations. Immediate patching is strongly recommended.
Citrix has released security updates addressing two vulnerabilities in NetScaler ADC and Gateway, including a critical out-of-bounds read (CVE-2026-3055) and a high-severity race condition (CVE-2026-4368). These flaws can lead to sensitive information disclosure and user session mix-up, requiring immediate patching and session termination to prevent potential exploitation.
The Canadian Centre for Cyber Security released a daily digest of 9 security advisories covering critical vulnerabilities across major enterprise, Linux, and ICS platforms. Notably, a critical vulnerability in Craft CMS (CVE-2025-32432) is being actively exploited in the wild, and Citrix has patched critical flaws in NetScaler ADC and Gateway.
