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Zero Days CVE-2026-88771 and CVE-2026-88772 Exploited in the Wild ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 2 min read Related Products [![Cortex icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/cortex_RGB_logo_Icon_Color.png)Cortex](https://unit42.paloaltonetworks.com/product-category/cortex/ "Cortex")[![Cortex Xpanse icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/cortex_RGB_logo_Icon_Color.png)Cortex Xpanse](https://unit42.paloaltonetworks.com/product-category/cortex-xpanse/ "Cortex Xpanse")[![Unit 42 Incident Response icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/unit42_RGB_logo_Icon_Color.png)Unit 42 Incident Response](https://unit42.paloaltonetworks.com/product-category/unit-42-incident-response/ "Unit 42 Incident Response") * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) By: * [Unit 42](https://unit42.paloaltonetworks.com/author/unit42/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:September 28, 2026 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) * [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-tags-grey.svg) Tags: * [Citrix Netscaler](https://unit42.paloaltonetworks.com/tag/citrix-netscaler/) * [Denial of service](https://unit42.paloaltonetworks.com/tag/denial-of-service/) * [Remote Code Execution](https://unit42.paloaltonetworks.com/tag/remote-code-execution/) * [Zero-day](https://unit42.paloaltonetworks.com/tag/zero-day/) * [![Download 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[Citrix reports](https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096) that CVE-2026-88771 and CVE-2026-88772 have been exploited in the wild. As of Sept. 27, 2026, Palo Alto Networks Cortex Xpanse has identified 50,277 exposed instances that could potentially be vulnerable to these CVEs based on our telemetry. * CVE-2026-88771 is a remote code execution (RCE) vulnerability that fails to properly validate input and allows an unauthenticated actor to run commands against NetScaler ADC and NetScaler Gateway systems * CVE-2026-88772 is a memory overflow vulnerability that can lead to a remote code execution (RCE) or denial of service (DoS) on the Datagram Transport Layer Security (DTLS) configuration on NetScaler ADC and NetScaler Gateway systems Both vulnerabilities have a CVSS v4.0 base score of 9.5. The [Unit 42 Incident Response team](https://start.paloaltonetworks.com/contact-unit42.html) can also be engaged to help with a compromise or to provide a proactive assessment to lower your risk. |-------------------------------|------------------------------------| | **Vulnerabilities Discussed** | **CVE-2026-88771, CVE-2026-88772** | ## Interim Guidance Unit 42 recommends that customers update their Citrix software to the latest versions as soon as possible, as well as following the recommendations: * **Confirm exposure** following the "Steps to determine if an appliance meets the CVE preconditions" section of the [Citrix Security Advisory](https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096) for these vulnerabilities * **Isolate the vulnerable systems** from the network * **Preserve evidence** by capturing the following: * A NetScaler VPX instance snapshot * Logs on remote syslog servers and NetScaler Console * A technical support bundle * A packet engine core dump * **Hunt** for the following: * Signs of suspicious administrative sessions * Unexpected outbound connections * Unexplained gaps in logging *Note: These are not tactics, techniques and procedures (TTPs) we have observed specifically related to these vulnerabilities. They should be seen as general hunting guidance until more is known about the exploitation activity identified by Citrix in their advisory.* * **Update and patch** to the latest versions *Note: Updating and patching will not remove access for attackers that have already established persistence within a compromise the network.* As of Sept. 27, 2026, Palo Alto Networks[Cortex Xpanse](https://docs-cortex.paloaltonetworks.com/p/XPANSE) has identified the presence of over 50,277 exposed instances potentially vulnerable to these CVEs based on our telemetry. If you think you might have been compromised or have an urgent matter, get in touch with the [Unit 42 Incident Response team](https://start.paloaltonetworks.com/contact-unit42.html) or call: * North America: Toll Free: +1 (866) 486-4842 (866.4.UNIT42) * UK: +44.20.3743.3660 * Europe and Middle East: +31.20.299.3130 * Asia: +65.6983.8730 * Japan: +81.50.1790.0200 * Australia: +61.2.4062.7950 * India: 000 800 050 45107 * South Korea: +82.080.467.8774 ## Additional References * [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](https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096) *Updated Sept. 27, 2026 at 4:15 p.m. PT to add information about Cortex Xpanse telemetry.* Back to top ### Tags * [Citrix Netscaler](https://unit42.paloaltonetworks.com/tag/citrix-netscaler/ "Citrix Netscaler") * [Denial of service](https://unit42.paloaltonetworks.com/tag/denial-of-service/ "denial of service") * [Remote Code Execution](https://unit42.paloaltonetworks.com/tag/remote-code-execution/ "Remote Code Execution") * [Zero-day](https://unit42.paloaltonetworks.com/tag/zero-day/ "zero-day") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: 3 Consulting Myths Debunked by Unit 42 Experts](https://unit42.paloaltonetworks.com/3-consulting-myths-debunked-by-unit-42-experts/ "3 Consulting Myths Debunked by Unit 42 Experts") ### Table of Contents * ### Related Articles * [The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/ "article - table of contents") * [Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution](https://unit42.paloaltonetworks.com/captive-portal-zero-day/ "article - table of contents") * [Fracturing Software Security With Frontier AI Models](https://unit42.paloaltonetworks.com/ai-software-security-risks/ "article - table of contents") ## Related Vulnerabilities Resources ![Pictorial representation of a group of people interacting with a dynamic 3D holographic display of colorful, undulating data waves on a table.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/09/11_Myth-Busting_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/08/Insights-icon-white.svg)Insights](https://unit42.paloaltonetworks.com/category/insights/) August 4, 2026 [#### The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/) * [AI](https://unit42.paloaltonetworks.com/tag/ai/ "AI") * [Frontier AI](https://unit42.paloaltonetworks.com/tag/frontier-ai/ "Frontier AI") * [Vulnerability Exploitation](https://unit42.paloaltonetworks.com/tag/vulnerability-exploitation/ "Vulnerability Exploitation") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/ "The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software") ![Pictorial representation of AI-enabled autonomous cyberattacks. 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