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Citrix urges customers to fix critical NetScaler authentication bypass (CVE-2026-19490)
Citrix patched a critical authentication bypass, CVE-2026-19490, in NetScaler Gateway and NetScaler ADC, urging customers to upgrade immediately.
Citrix has patched two flaws in NetScaler ADC and NetScaler Gateway. CVE-2026-19490 is a critical authentication bypass (CVSS v4.0 9.3) that works when the appliance is configured as an SSL VPN, ICA Proxy, CVPN, RDP Proxy Gateway or AAA virtual server, with additional conditions depending on firmware and SAML configuration. A second flaw, CVE-2026-19489 (CVSS 8.8), is a memory overflow that can cause denial of service when SIP ALG is enabled on LSN setups. Rapid7 had not observed exploitation as of August 19, 2026, but urged emergency patching; a signature-based mitigation is available via NetScaler Console.
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Critical NetScaler Flaw Can Bypass Authentication on Certain Gateway and AAA Servers
Citrix patches critical NetScaler Gateway and AAA authentication bypass CVE-2026-19490 (CVSS 9.3) plus a SIP ALG memory overflow flaw; exploitation attempts observed.
Citrix fixed CVE-2026-19490 (CVSS 9.3), an authentication bypass affecting customer-managed NetScaler ADC and Gateway appliances configured as Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual servers, and CVE-2026-19489 (CVSS 8.8), a memory overflow causing DoS when SIP ALG is enabled in Large Scale NAT groups. Updates are available in versions 14.1-73.32, 13.1-63.21, and corresponding FIPS/NDcPP builds, while Citrix-managed cloud services were already patched. The flaws were reported by Samarth Vashisht of JPMorgan Chase's penetration-testing team, and Previdian later observed 10 exploitation attempts against CVE-2026-19490 from six unique IP addresses in Australia, Germany, Japan, and the US, with no confirmed compromise.
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CVE-2026-34908: UniFi OS Auth Bypass Vulnerability
Ubiquiti disclosed CVE-2026-34908, a CVSS 10.0 authentication bypass in UniFi OS letting network-adjacent attackers alter device configuration without credentials.
CVE-2026-34908 is an improper access control flaw (CWE-284) in Ubiquiti UniFi OS devices, disclosed in UI Security Advisory Bulletin 064, with a CVSS 3.1 base score of 10.0. An unauthenticated network-adjacent attacker can bypass access controls and modify system configuration, with scope-changed impact on downstream network services such as routing, VPN, and connected access points. Fixed firmware is available, and workarounds include restricting management ports to trusted subnets, isolating management interfaces on a dedicated VLAN, and disabling remote access features. No public proof-of-concept code was observed at the time of publication.
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Check Point Discloses Two 9.8-Rated VPN Certificate Flaws Enabling Unauthenticated RCE
Check Point patched two 9.8-rated VPN certificate flaws, CVE-2026-85102 and CVE-2026-85103, enabling unauthenticated remote code execution; no exploitation observed yet.
Check Point disclosed and began patching two critical (CVSS 9.8) vulnerabilities in VPN certificate handling on September 9: CVE-2026-85102, a certificate trust validation failure in VPN negotiation on Security Gateways, and CVE-2026-85103, a heap-based buffer overflow in ASN.1 decoding affecting Quantum Security Gateways and Security Management Server. Affected branches include R81.20, R82, and R82.10 Jumbo Hotfix levels; fixes ship via Live Patch or the latest Jumbo Hotfix. The company found both internally and reports no evidence of exploitation; the Canadian Centre for Cyber Security also published an advisory listing Spark firewalls.
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FortiSandbox Vulnerability Allows Attackers to Access Sensitive Information via Crafted HTTP Requests
Fortinet disclosed CVE-2026-26084 (CVSS 8.9), an unauthenticated information-disclosure flaw in the FortiSandbox web UI, urging upgrades.
Fortinet patched CVE-2026-26084, a CWE-284 improper access control flaw in the shared web UI of FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS that lets unauthenticated attackers read sensitive data via crafted HTTP requests. Affected releases include FortiSandbox 5.0.0-5.0.5 and 4.4.0-4.4.8, Cloud 5.0.4-5.0.5, and PaaS 5.0.4-5.0.5; fixes arrive in 5.0.6+ and 4.4.9+, while FortiSandbox 5.2 and Cloud 4.4 are unaffected. The issue was found internally by Fortinet's Product Security team, and the company reports no evidence of exploitation in the wild. Disclosure carries only confidentiality impact, but exposed sandbox configurations and logs could aid follow-on attacks.
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Veeam, Terraform MCP, Django Patch Critical Flaws, Led by CVSS 10.0 Cross
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N-able Issues Fourth N-central Hotfix in Five Weeks for Unauthenticated RCE Flaw
N-able shipped Hotfix 4 for a CVSS 10.0 unauthenticated RCE (CVE-2026-86218) in N-central RMM, with conflicting statements on exploitation.
N-able released 2026.3 Hotfix 4 (build 2026.3.1.14) fixing CVE-2026-86218, a static code injection weakness (CWE-96) scored 10.0 on CVSS 4.0 that enables pre-authentication remote code execution on on-premises N-central RMM servers. Hosted NCOD instances are already patched; N-able's incident notice says the flaw was observed exploited in the wild while its release notes say exploitation is unconfirmed. Huntress, which has tracked N-central attacks since August, advises IP allowlisting, VPN-only access, or taking internet-reachable servers offline until patching. It is the fourth hotfix in five weeks, following fixes for CVE-2026-86206 and CVE-2026-86207, which CISA added to its Known Exploited Vulnerabilities catalog.
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