Citrix NetScaler flaws exploited in the wild
CERT-FR warns two of eight new Citrix NetScaler ADC/Gateway vulnerabilities are being actively exploited, enabling RCE, DoS and security bypass.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 8 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-88771 and CVE-2026-88772 as exploited in the wild.
CERT-FR has issued an advisory covering eight vulnerabilities (CVE-2026-88771 through CVE-2026-88778) affecting Citrix NetScaler ADC and NetScaler Gateway. Affected versions include NetScaler ADC 13.1-FIPS before 13.1-NDcPP 13.1.37.279, 13.1.x before 13.1-64.23, 14.1-FIPS before 14.1-73.37 FIPS, and 14.1.x before 14.1-73.37, as well as NetScaler Gateway 13.1.x before 13.1-64.23 and 14.1.x before 14.1-73.37. Depending on the specific CVE, successful exploitation can lead to remote arbitrary code execution, remote denial of service, or bypass of security policy.
Citrix has confirmed that CVE-2026-88771 and CVE-2026-88772 are being actively exploited in the wild. The vendor further states that unpatched devices remain vulnerable in their default configuration, meaning no workaround or configuration change mitigates exposure — patching is mandatory. Citrix has published indicators of compromise in its security bulletin (CTX697096) to assist defenders in identifying exploitation.
Defenders operating NetScaler ADC or Gateway appliances should treat this as an urgent patching priority given confirmed in-the-wild exploitation of two of the eight flaws, review the vendor's IOC guidance, and check appliance logs for signs of compromise prior to and during remediation.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1235
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