# CVE-2026-88772 — Citrix NetScaler ADC

**CISA KEV**

> As of 2026-09-27, CVE-2026-88772 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. It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-09-27), with a US federal remediation deadline of 2026-09-30. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-88772, most recently “Citrix Patches Two Actively Exploited NetScaler Zero-Days (CVE-2026-88771, CVE-2026-88772)”.

**Last updated:** 2026-09-27

## What is CVE-2026-88772?

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 Remote Code Execution or Denial of Service

The record classifies CVE-2026-88772 under weakness class [CWE-119](https://cwe.mitre.org/data/definitions/119.html). 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:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **CISA KEV:** Listed since 2026-09-27, federal remediation deadline 2026-09-30
- **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- **Published:** 2026-09-27

## Is CVE-2026-88772 being exploited?

CISA added CVE-2026-88772 to the Known Exploited Vulnerabilities catalog on 2026-09-27, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-09-30 under BOD 22-01. It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Citrix NetScaler**: ADC, Gateway

## How to fix CVE-2026-88772

Because CVE-2026-88772 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-09-30. No vendor patch reference has been recorded for CVE-2026-88772 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-2026-88772

2 tracked threats in the Threadlinqs corpus reference CVE-2026-88772, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Citrix Patches Two Actively Exploited NetScaler Zero-Days (CVE-2026-88771, CVE-2026-88772)](https://intel.threadlinqs.com/threat/TL-2026-2703) — CRITICAL · 2026-09-27
- [CISA Adds Two Citrix NetScaler Vulnerabilities (CVE-2026-88771, CVE-2026-88772) to KEV Catalog](https://intel.threadlinqs.com/threat/TL-2026-2711) — CRITICAL · 2026-09-27

## Sources

Enriched from CVE.org, NVD, CISA KEV, GitHub Security Advisories. Last verified by Threadlinqs on 2026-09-28. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [support.citrix.com](https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096&articleTitle=Citrix_NetScaler_ADC_and_Citrix_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_88771_CVE_2026_88772_CVE_2026_88773_CVE_2026_88774_CVE_2026_88775_CVE_2026_88776_CVE_2026_88777_and_CVE_2026_88778)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-88772
Full detection coverage and IOCs for threats exploiting CVE-2026-88772 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp