CISA Adds Two Known Exploited Vulnerabilities to Catalog
CISA added actively exploited Citrix NetScaler flaws CVE-2026-88771 and CVE-2026-88772 to the KEV catalog.
CISA added two Citrix NetScaler vulnerabilities to its Known Exploited Vulnerabilities Catalog based on evidence of active exploitation. CVE-2026-88771 is an improper input validation flaw, and CVE-2026-88772 is an improper restriction of operations within a memory buffer. Binding Operational Directive 26-04 requires Federal Civilian Executive Branch agencies to rapidly remediate KEV entries on publicly exposed assets that grant total control after exploitation and to check for compromise before patching. CISA encourages all organizations to prioritize these vulnerabilities.
- CVE-2026-88771 is a Citrix NetScaler improper input validation flaw.
- CVE-2026-88772 is a NetScaler memory-bounds restriction vulnerability.
- CISA added both to KEV based on evidence of active exploitation.
- BOD 26-04 tells federal agencies to prioritize exposed high-risk KEV flaws.
Vulnerabilities mentionedAll →
- CVE-2026-887729.51%Unauthenticated RCE/DoS in Citrix NetScaler ADC and Gatewaypublished · Citrix NetScaler ADC KEV PoC ×2+1 related
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
Full article236 words · extracted from cisa.gov · click to collapse
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation.
- CVE-2026-88771 Citrix NetScaler Improper Input Validation Vulnerability
- CVE-2026-88772 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose 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. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s 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.
Aware of an exploited vulnerability not currently listed in the KEV Catalog? Submit it for potential addition through CISA’s KEV Nomination Form. Potential KEV additions must have a CVE ID, evidence of exploitation, and clear mitigation guidance.
Text extracted automatically; images, tables and formatting may be missing. Original: https://www.cisa.gov/news-events/alerts/2026/09/27/cisa-adds-two-known-exploited-vulnerabilities-catalog