CISA Adds Two Citrix NetScaler Vulnerabilities to Known Exploited Catalog

The Cybersecurity and Infrastructure Security Agency (CISA) has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog based on evidence of active exploitation. CVE-2026-88771, an improper input validation vulnerability, and CVE-2026-88772, an improper restriction of operations within the bounds of a memory buffer vulnerability, both affect Citrix NetScaler products. CISA identified evidence of active exploitation as the basis for the additions, marking these vulnerabilities as frequent attack vectors for malicious cyber actors and posing significant risks to the federal enterprise.

Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. The directive reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities listed in the KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied.

While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria. Organizations aware of an exploited vulnerability not currently listed in the KEV Catalog can submit it for potential addition through CISA's KEV Nomination Form, which requires a CVE ID, evidence of exploitation, and clear mitigation guidance.