Threat Intelligence / CVE / CVE-2026-88773

CVE-2026-88773 — Citrix NetScaler ADC

CVSS v4.0 9.3 (Critical, derived from score) · Priority 4.7/10 · Published 2026-09-27

As of 2026-09-27, CVE-2026-88773 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 9.3. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-88773, most recently “Citrix Patches Two Actively Exploited NetScaler Zero-Days (CVE-2026-88771, CVE-2026-88772)”.

Last updated: 2026-09-27

What is CVE-2026-88773?

Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') 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 and NDcPP; Gateway: before 14.1-73.37 FIPS and before 13.1-64.23.

The record classifies CVE-2026-88773 under weakness class CWE-444. 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
9.3 — Critical (derived from score)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-09-27

Is CVE-2026-88773 being exploited?

No public exploitation evidence for CVE-2026-88773 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-2026-88773

No vendor patch reference has been recorded for CVE-2026-88773 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-2026-88773

1 tracked threat in the Threadlinqs corpus references CVE-2026-88773, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

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

Other references

Full detection coverage & IOCs for threats exploiting CVE-2026-88773 are available via the Threadlinqs MCP server (Purple tier). View plans →

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