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---
title: Citrix NetScaler Zero-Day RCE vulnerabilities: FAQ
description: Two unconfirmed zero-day remote code execution vulnerabilities in Citrix NetScaler are reportedly being actively exploited in the wild, based on a leaked...
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og:description: Two unconfirmed zero-day remote code execution vulnerabilities in Citrix NetScaler are reportedly being actively exploited in the wild, based on a leaked...
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# Citrix NetScaler Zero-Day RCE vulnerabilities: FAQ

**[Tenable Blog](https://daily.dev/sources/tenable-blog)** · 5 min read · 0 upvotes · 1 comments

## Summary

Two unconfirmed zero-day remote code execution vulnerabilities in Citrix NetScaler are reportedly being actively exploited in the wild, based on a leaked NCSC-NL pre-notification circulated on Reddit and confirmed by researchers watchTowr and Kevin Beaumont. No CVEs have been assigned, no formal Citrix advisory exists, and no patches or public proofs-of-concept are available as of September 27. Citrix is reportedly planning patches early the following week. The flaws are unrelated to the previously disclosed CVE-2026-19490 and CVE-2026-19489. NetScaler has historically been a frequent target, with 13 NetScaler-related entries in CISA's KEV catalog, and roughly two-thirds of past exploitation attributed to APT groups.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://www.tenable.com/blog/frequently-asked-questions-about-reported-citrix-netscaler-zero-day-vulnerabilities>

## Questions this post answers

### Are there patches available yet for the new Citrix NetScaler zero-day vulnerabilities being exploited?

No, as of September 27, 2026, Citrix has not published a formal security advisory and no patches are available. Public reporting indicates Citrix plans to release patches early in the week of September 28, 2026. No CVE IDs have been assigned yet, and no public proof-of-concept exploits exist.

_Track this developing NetScaler patch timeline on daily.dev before deciding whether to take devices offline._

### Is the new Citrix NetScaler zero-day exploit related to CVE-2026-19490 or CVE-2026-19489?

No, neither CVE-2026-19490 nor CVE-2026-19489 appears related to the newly reported zero-days. Both are previously disclosed NetScaler ADC and Gateway vulnerabilities with existing patches; CVE-2026-19490 was added to CISA's Known Exploited Vulnerabilities catalog on September 9, 2026, but is a distinct issue from the unpatched flaws now under active exploitation.

_Follow how this new zero-day differs from prior NetScaler CVEs on daily.dev while patch details emerge._

### How did the Citrix NetScaler zero-day vulnerability information first become public?

Details first surfaced on September 25, 2026, through a Reddit post on r/Citrix citing a pre-notification reportedly from the Dutch national cyber security center (NCSC-NL), distributed under Traffic Light Protocol AMBER+STRICT restrictions. Researchers watchTowr and Kevin Beaumont subsequently confirmed on September 26 that active exploitation was occurring, though no vendor advisory had been issued.

_Watch for the official Citrix advisory on daily.dev to confirm details currently circulating from leaked sources._

## Community discussion

Top comments from developers on daily.dev.

**@patrickgarber** · 0 upvotes

> Is there any information on this? Trying to get word from Citrix but literally nothing

## Similar posts on daily.dev

- [Citrix NetScaler bug may be multiple flaws in one](https://daily.dev/posts/citrix-netscaler-bug-may-be-multiple-flaws-in-one-kggs3gauu) · The Register · 0 upvotes · 0 comments

---

Tags: [#security](https://daily.dev/tags/security), [#zero-day](https://daily.dev/tags/zero-day)

[View this post on daily.dev](https://daily.dev/posts/citrix-netscaler-zero-day-rce-vulnerabilities-faq-afwx5v0n2)

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