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Citrix NetScaler urgent patch guidance for CVE-2026-19490

Advisory/Mitigation
First reported
Last updated
Happening score
H score 33
1 unique sources, 1 articles

Summary

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Citrix NetScaler administrators were told to urgently review exposure and upgrade impacted appliances for CVE-2026-19490, with NCC-BE later urging organizations to prioritize patching vulnerable deployments. The guidance centers on affected NetScaler ADC and NetScaler Gateway systems and ties remediation to the authentication-bypass flaw now being targeted in the wild.

Related Happenings

Citrix NetScaler authentication bypass (CVE-2026-19490)

Vulnerability
H score29 First: 04.09.2026 18:25 Last: 04.09.2026 18:25 Sources 1

How related: "On 3 September, one of our NetScaler sensors received requests matching the PoC from three distinct source IPs, geolocated to Australia, the United States and Germany," Dewhurst told BleepingComputer.

About this happening: CVE-2026-19490 is now being actively probed in the wild, putting exposed Citrix NetScaler appliances at risk of remote authentication bypass. Previdian observe...

Open Happening

Citrix NetScaler ADC/Gateway memory overflow flaw (CVE-2026-8452)

Vulnerability
H score34 First: 27.08.2026 12:16 Last: 27.08.2026 12:16 Sources 1

About this happening: CVE-2026-8452 is an actively exploited memory overflow flaw in Citrix NetScaler ADC and NetScaler Gateway appliances, including systems configured with Gateway V...

Open Happening

Microsoft security patch release for CVE-2026-62832

Security Patch Release
H score5 First: 12.08.2026 09:41 Last: 12.08.2026 09:41 Sources 1

About this happening: Microsoft shipped patches for 421 security flaws, including 236 flaws in Windows, as part of a broad update that also remediates multiple named CVEs. The release cover...

Open Happening

Microsoft security patch release for CVE-2026-68820

Security Patch Release
H score28 First: 12.08.2026 00:28 Last: 12.08.2026 00:28 Sources 1

About this happening: Microsoft released August 2026 Patch Tuesday updates for Windows operating systems and supported software, fixing at least 398 vulnerabilities. The bundle includes...

Open Happening

Windows Ancillary Function Driver for WinSock zero-day privilege escalation (CVE-2026-68820)

Vulnerability
H score29 First: 11.08.2026 21:08 Last: 11.08.2026 21:08 Sources 1

About this happening: CVE-2026-68820 in Windows Ancillary Function Driver for WinSock (AFD.sys) was patched after active exploitation in zero-day attacks, leaving affected Windows syste...

Open Happening

Timeline

  1. 04.09.2026 18:25 2 articles · 13h ago

    Citrix and NCC-BE urge patching for CVE-2026-19490

    Mitigation Patch Update

    Citrix told customers to review the official NetScaler ADC and NetScaler Gateway security bulletin, assess whether their deployments were affected, and upgrade impacted appliances to recommended builds for CVE-2026-19490; NCC-BE later warned on Friday that exploitation attempts were targeting the flaw and urged organizations to prioritize patching vulnerable Citrix NetScaler appliances.

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