CISA Adds One Known Exploited Vulnerability to Catalog
CISA adds CVE-2026-88779, a Citrix NetScaler vulnerability, to its KEV Catalog.
CISA has added CVE-2026-88779, a vulnerability affecting Citrix NetScaler, to its Known Exploited Vulnerabilities (KEV) Catalog due to evidence of active exploitation. This addition mandates federal agencies to prioritize its remediation under Binding Operational Directive (BOD) 26-04, which emphasizes risk-based vulnerability management for publicly exposed assets. CISA encourages all organizations to adopt similar practices.
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The lesson from this incident
Full lessonCVE-2026-88779 in Citrix NetScaler has been confirmed as actively exploited, prompting CISA to add it to the Known Exploited Vulnerabilities Catalog and mandate remediation for federal agencies under BOD 26-04. NetScaler is a widely deployed network gateway product, making it a high-value target for threat actors seeking initial access to enterprise environments. The active exploitation of this vulnerability underscores the danger of delayed patching on internet-facing infrastructure, where exposure windows are measured in hours, not days. Organizations that lack a risk-based vulnerability prioritization process are especially at risk of missing critical remediation deadlines for high-impact flaws like this one.
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Indicators of Compromise
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- cve — CVE-2026-88779