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Citrix Systems, now part of Cloud Software Group, makes NetScaler ADC/Gateway appliances for application delivery, load balancing, and remote access.
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Citrix confirmed CVE-2026-88779, a third exploited NetScaler zero-day, after appliances patched against the previous two began rebooting under attack. The vendor rates it denial of service, though logged payloads and a researcher's honeypot point toward code execution.
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CISA added Citrix NetScaler flaw CVE-2026-88779 to its exploited-vulnerabilities catalog on 4 October, citing evidence of active exploitation. For anyone running the appliance, confirmed use by attackers puts this fix ahead of work ranked by severity score alone.
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Two exploited Citrix NetScaler zero-days and a CVSS 9.8 Cisco SD-WAN Manager flaw top a weekly DACH OT risk bulletin. For many operators, both products enforce segmentation into OT, so an attacker who takes one over is standing in front of the control systems.
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Attackers using two NetScaler zero-days since early September left webshells that patching to 14.1-73.37 or 13.1-64.23 does not remove. Operators have to search every appliance for those traces, patched or not, and move OT remote access onto a jump host of its own.
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Citrix disclosed eight NetScaler flaws on September 27, two already exploited, with a federal fix deadline three days later. The box holds authentication, remote access, certificates and admin trust, so cleaning up a compromised one means saving evidence first and then invalidating each of them.
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LevelBlue says attackers are exploiting NetScaler flaw CVE-2026-88771, rated 9.5, to create a hidden superuser account and plant web shells. The patch closes the injection but removes neither, so already-exposed appliances need a compromise check.
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Mandiant and Google traced a September 2026 campaign exploiting NetScaler bug CVE-2026-88772, CVSS 9.5, to root on appliances with no login. From there the intruders drop web shells and a Python tunneler that reaches into victims' internal networks to steal credentials.
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Citrix has patched eight NetScaler flaws, including two zero-days scored 9.5 that CISA says attackers are exploiting globally. The safest response costs a planned outage of remote access now and months of monitoring afterwards.
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Exposure to CVE-2026-19490, a CVSS 9.8 NetScaler bypass CISA lists as exploited, depends on each appliance's exact build and SAML setup. Older builds qualify with any Gateway or AAA virtual server, while later builds short of the fix also need a SAML action configured.
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Citrix has fixed two NetScaler ADC and Gateway flaws, each rated 9.5 out of 10, that attackers were exploiting before any patch existed. CISA wants owners to look for signs of compromise first because the update can erase the evidence, so the upgrade comes second.
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watchTowr says attackers exploited CVE-2026-88771, a pre-auth command injection in default-config Citrix NetScaler, before any fix existed. Upgrading to 14.1-73.37 or 13.1-64.23 closes the hole, though a gateway exposed in that window may already have been used.
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Citrix confirmed attackers are exploiting two CVSS 9.5 pre-auth RCE flaws in NetScaler ADC and Gateway, one of them present in default configurations. Self-managed appliances need the fixed build, installed after evidence is saved, since an upgrade can erase signs of intrusion.
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watchTowr says attackers exploited two remote code execution flaws in Citrix NetScaler ADC and Gateway before any fix existed. The August patch for CVE-2026-19490 fixes a different bug, so every operator now has to decide whether to keep the box online and whether to assume it is breached.
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CVE-2026-19490 lets an unauthenticated attacker past NetScaler gateway and AAA virtual servers. Rapid7 has seen no exploitation yet and expects it shortly.
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CVE-2026-8452 shipped as a June 30 denial-of-service fix. A WatchTowr proof of concept turned it into pre-auth code execution, and in-the-wild exploitation followed.
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CISA says all four are under active exploitation, and three of them are unauthenticated flaws in edge and management appliances. Its own alert cites BOD 26-04 and prints no due date for any of them.
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On a September 10 podcast, Eclypsium researchers walked from vulnerable signed UEFI shells to Fire Ant binaries wearing EDR agent names. The common thread is verification: a defender can check very little of that stack alone.
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The mid-August Citrix advisory that many teams parked behind lower-risk work now has attack traffic behind it, and the appliances in scope are the ones fronting remote access. Role and firmware decide scope, not appliance count.
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Citrix shipped fixes on 19 August 2026 for a memory overflow and an authentication bypass in NetScaler ADC and Gateway, but each one needs particular features turned on, so the inventory has to come before the change window.
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The overflow in CVE-2026-8452 sits in PrefixList canonicalization, which NetScaler performs before it validates the SAML signature, so an attacker needs no trust with your IdP and only a reachable virtual server with SAML turned on.
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Security · August 26, 2026 · 1 publisher