CVE-2026-88772: Hackers exploit Citrix NetScaler zero-day to deploy web shells

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CVE-2026-88772

KEV ✓ EPSS 0.77 EPSS k 11. 11. 2026 náprava do 30. 9. 2026

Hodnocení závažnosti

9.5 CVSS 4.0 NetScaler

útok odkudkoli z internetu nutné obejít ochrany funguje v běžném nastavení bez přihlášení bez zásahu uživatele
dopad plný únik dat úplná změna dat úplný výpadek
přesah plný únik i v okolních systémech úplná změna dat i v okolních systémech úplný výpadek i v okolních systémech

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

zvyšuje závažnost mírně zvyšuje závažnost snižuje závažnost

Hvězdička u CVE znamená, že jsem to číslo vytáhl z širšího textu článku. Neukazuju u něj proto KEV, EPSS ani CVSS, a to preventivně, protože článek se na něj mohl jen odkazovat, třeba jako na starší kauzu. Fakta o samotném CVE jsou nahoře.

SPOJENO PŘES CVE Aktivně zneužívané zranitelnosti v Citrix NetScaler

Upozorňujeme na aktivně zneužívané zranitelnosti CVE-2026-88771 a CVE-2026-88772 v produktu Citrix Netscaler, které umožňují vzdálené spuštění kódu. Doporučujeme bezodkladně aktualizovat na verzi 14.1-73.37, 13.1-64.23, 14.1-73.37 FIPS nebo 13.1-37.279 a novější podle používané produktové řady. Dále doporučujeme prověřit indikátory kompromitace, jelikož aktualizace nemusí kompromitaci odstranit. Zranitelnosti Zranitelnost CVE-2026-88771 spočívá v nesprávném ověřování vstupů a umožňuje…

KEV ✓ EPSS 0.82 CVSS 9.5 CVE-2026-88771 CVE-2026-88772 Citrix NetScaler veřejná správa finance školství CZ US HU GB FR IT SE

tg: varování tg: zneužíváno tg: zranitelnost tg: rozbor tp: malware tp: identita

· NÚKIB · Aktivně zneužívané zranitelnosti v Citrix NetScaler · Mandiant / Google TI · Defending Against Active Exploitation of Citrix NetScaler ADC and Gateway Appliances · Palo Alto Unit 42 · Threat Brief: NetScaler Zero Days CVE-2026-88771 and CVE-2026-88772 Exploited in the Wild · NKI Maďarsko · Riasztás a NetScaler ADC és NetScaler Gateway termékeket érintő sérülékenységekről · zachyceno · Sophos Threat Research · Citrix NetScaler vulnerabilities (CVE-2026-88771, CVE-2026-88772) in active exploitation · zachyceno · CERT-FR – alerty · Multiples vulnérabilités dans Citrix NetScaler ADC et Gateway (28 septembre 2026) · CSIRT Itálie (ACN) · Vulnerabilità in prodotti Citrix NetScaler · CERT-SE · Kritiska sårbarheter i Citrix NetScaler ADC and Citrix NetScaler Gateway

InfraTrust report warns of exploited flaws in critical network infrastructure

Attackers are actively exploiting vulnerabilities across critical network infrastructure, and PHP flaws known as "PHP2Shell" put the web management interfaces of firewalls, VPNs, application delivery controllers, and other appliances at risk. [...]

CVE-2026-0322 * CVE-2026-104286 * CVE-2026-104935 * CVE-2026-109618 * CVE-2026-109619 * CVE-2026-114625 * CVE-2026-31431 * CVE-2026-76504 * CVE-2026-76519 * CVE-2026-88771 * CVE-2026-88772 * CVE-2026-88779 * CVE-2026-93616 * CVE-2026-93952 * CVE-2026-94127 * US

tg: varování tg: zneužíváno

· BleepingComputer · InfraTrust report warns of exploited flaws in critical network infrastructure

Citrix warns admins to patch new NetScaler RCE flaw immediately

Citrix has warned IT administrators to patch systems immediately against a new critical vulnerability affecting NetScaler ADC networking appliances and NetScaler Gateway secure remote access solutions. [...]

CVE-2026-107406 * CVE-2026-3055 * CVE-2026-4368 * CVE-2026-88771 * CVE-2026-88772 * CVE-2026-88779 * Citrix US

tg: zranitelnost

· BleepingComputer · Citrix warns admins to patch new NetScaler RCE flaw immediately

5th October – Threat Intelligence Report

For the latest discoveries in cyber research for the week of 5th October, please download our Threat Intelligence Bulletin. TOP ATTACKS AND BREACHES Arizona’s state court system has suffered a phishing-led cyberattack after an employee clicked a malicious link. Attackers copied backup files containing protective-order records and more than 150,000 Foster Care Review Board reports dating back to 2010, exposing personal and case-related information belonging to current and former participants.…

KEV ✓ EPSS 0.82 CVSS 9.9 CVE-2026-76504 CVE-2026-86950 CVE-2026-88771 CVE-2026-88772 CVE-2026-90970 Citrix Cisco Apple GitLab IL

tg: přehled tp: malware tp: ransomware tp: únik dat

· Check Point Research · 5th October – Threat Intelligence Report

SPOJENO PŘES CVE Hackers exploit Citrix NetScaler zero-day to deploy web shells

Cybersecurity firms say attackers exploited the Citrix NetScaler CVE-2026-88772 zero-day to deploy custom web shells and tunneling malware, gain root access, steal credentials, and spread into internal networks. [...]

KEV ✓ EPSS 0.77 CVE-2026-88772 Citrix US

tg: incident tg: zneužíváno tg: zranitelnost tp: malware tp: identita

· BleepingComputer · Hackers exploit Citrix NetScaler zero-day to deploy web shells · zachyceno · CISA KEV · Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability (CVE-2026-88772)

SPOJENO PŘES CVE Citrix security advisory (AV26-965)

Serial number: AV26-965Date: September 28, 2026 As of September 27, 2026, Citrix is affected by vulnerabilities in the following products: NetScaler ADC and NetScaler Gateway 14.1 Prior to 14.1-73.37 NetScaler ADC and NetScaler Gateway 13.1 Prior to 13.1-63.23 NetScaler ADC FIPS Prior to 14.1-73.37 FIPS NetScaler ADC FIPS and NDcPP Prior to 13.1-37.279 On September 27, 2026, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-88771 and CVE-2026-88772 to their Known Exploited…

KEV ✓ EPSS 0.82 CVSS 9.5 CVE-2026-88771 CVE-2026-88772 CVE-2026-88773 CVE-2026-88774 CVE-2026-88775 CVE-2026-88776 CVE-2026-88777 CVE-2026-88778 Citrix CA FI FR NL AT US

tg: zneužíváno tg: zranitelnost

· Cyber Centre Kanada · Citrix security advisory (AV26-965) · zachyceno · NCSC-FI · Critical vulnerabilities in in Citrix NetScaler ADC and Citrix NetScaler Gateway · zachyceno · CERT-FR – avis · Multiples vulnérabilités dans Citrix NetScaler ADC et Gateway (28 septembre 2026) · NCSC-NL · NCSC-2026-0394 [1.00] [H/H] Kwetsbaarheden verholpen in NetScaler ADC en NetScaler Gateway · CERT.at · Kritische Sicherheitslücken in Citrix NetScaler ADC und NetScaler Gateway - aktiv ausgenutzt - Updates verfügbar · zachyceno · CISA Advisories · Critical Zero-Day Vulnerabilities Exploited in Citrix NetScaler ADC, Gateway

Zero-Day Exploitation of Citrix NetScaler ADC and Gateway: CVE-2026-88771 and CVE-2026-88772

OverviewOn September 27, 2026, Citrix disclosed eight new vulnerabilities affecting NetScaler ADC and NetScaler Gateway, including two critical remote code execution (RCE) vulnerabilities: CVE-2026-88771 and CVE-2026-88772. Both of these RCE vulnerabilities carry a critical CVSSv4 score of 9.5, and both have been confirmed as being actively exploited in the wild as zero-days prior to the vendor disclosure. CVE-2026-88771 affects vulnerable NetScaler deployments in their default configuration,…

KEV ✓ EPSS 0.82 CVSS 9.5 CVE-2026-88771 CVE-2026-88772 CVE-2026-887729 CVE-2026-887739 Citrix US

tg: zneužíváno tg: zranitelnost

· Rapid7 · Zero-Day Exploitation of Citrix NetScaler ADC and Gateway: CVE-2026-88771 and CVE-2026-88772

CISA orders feds to patch exploited Citrix flaws by Wednesday

The Cybersecurity and Infrastructure Security Agency (CISA) has ordered U.S. government agencies over the weekend to secure their systems against attacks exploiting two critical Citrix NetScaler vulnerabilities. [...]

CVE-2026-19490 * CVE-2026-3055 * CVE-2026-4368 * CVE-2026-88771 * CVE-2026-88772 * Citrix veřejná správa US

tg: zneužíváno tg: zranitelnost tg: regulace

· BleepingComputer · CISA orders feds to patch exploited Citrix flaws by Wednesday