CVE-2026-88778
TCP Initial Sequence Number (ISN) prediction
Description
Predictable exact value from previous values 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.
INFO
Published Date :
Sept. 27, 2026, 5:16 p.m.
Last Modified :
Sept. 27, 2026, 5:16 p.m.
Remotely Exploit :
Yes !
Source :
50a63c94-1ea7-4568-8c11-eb79e7c5a2b5
Affected Products
The following products are affected by CVE-2026-88778
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5 | ||||
| CVSS 4.0 | HIGH | 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5 |
Solution
- Update ADC versions before 14.1-73.37.
- Update ADC versions before 13.1-64.23.
- Update Gateway versions before 14.1-73.37.
- Update Gateway versions before 13.1-64.23.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-88778.
| URL | Resource |
|---|---|
| https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-88778 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-88778
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-88778 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-88778 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5
Sep. 27, 2026
Action Type Old Value New Value Added Description Predictable exact value from previous values 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-342 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/88xxx/CVE-2026-88778.json">CVE-2026-88778</a> Added Reference https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096