Threat Intelligence / CVE / CVE-2026-88771

CVE-2026-88771 — Citrix NetScaler ADC

CVSS v4.0 9.5 (Critical, derived from score) · Priority 4.8/10 · Published 2026-09-27

As of 2026-09-27, CVE-2026-88771 is a Critical-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in Citrix NetScaler ADC, CVSS v4.0 9.5. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-88771, most recently “Citrix Patches Two Actively Exploited NetScaler Zero-Days (CVE-2026-88771, CVE-2026-88772)”.

Last updated: 2026-09-27

What is CVE-2026-88771?

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.

The record classifies CVE-2026-88771 under weakness class CWE-20. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1 day ago.

Severity and exploitation probability

CVSS v4.0 base score
9.5 — Critical (derived from score)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-09-27

Is CVE-2026-88771 being exploited?

No public exploitation evidence for CVE-2026-88771 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-09-27. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

How to fix CVE-2026-88771

No vendor patch reference has been recorded for CVE-2026-88771 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-88771

2 tracked threats in the Threadlinqs corpus reference CVE-2026-88771, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org. Last verified by Threadlinqs on .

Other references

Full detection coverage & IOCs for threats exploiting CVE-2026-88771 are available via the Threadlinqs MCP server (Purple tier). View plans →

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