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CVE-2026-88771

Critical CVSS 9.8 Known exploited

Published 2026-09-27 · last changed 2026-09-29 · added to CISA KEV 2026-09-27

This one is being exploited in the wild.

CISA added CVE-2026-88771 to the Known Exploited Vulnerabilities catalog on 2026-09-27. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2026-88771, which normally means it isn't a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release. NVD lists the affected software below.

What it is

Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated attacker to execute arbitrary commands.

Affected software

As listed by NVD. Version ranges vary per entry, so check the NVD record before treating a product name here as a yes or a no for a specific version.

Sources

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H