2026-014: Critical Vulnerabilities in Citrix NetScaler ADC and Gateway Sunday, September 27, 2026 07:40:52 PM CEST On 27 September 2026, Citrix published a security bulletin addressing 8 vulnerabilities affecting customer-managed Citrix NetScaler ADC and Citrix NetScaler Gateway, among which 2 critical unauthenticated Remote Code Execution (RCE) vulnerabilities. Citrix has confirmed active exploitation of these 2 critical vulnerabilities in the wild. CERT-EU recommends updating affected software and running a compromise assessment on those exposed on the internet.

2026-009: Critical Vulnerabilities in Microsoft SharePoint Thursday, July 23, 2026 09:13:03 AM CEST [UPDATED] On 14 July 2026, Microsoft released security updates addressing critical remote code execution (RCE) vulnerabilities in Microsoft SharePoint Server. On 20 July 2026, WatchTowr identified a proof-of-concept exploit code and subsequently observed active exploitation of CVE-2026-50522, a vulnerability part of an ongoing series of actively exploited flaws affecting on-premise SharePoint Server instances, including CVE-2026-32201, CVE-2026-45659, CVE-2026-56164, and CVE-2026-58644. CERT-EU strongly recommends updating affected servers immediately, rotating credentials for any assets that may have been exposed to the internet, and conducting a compromise assessment.

2026-006: Critical Vulnerability in PAN-OS Wednesday, May 06, 2026 10:44:32 AM CEST On 6 May 2026, Palo Alto published a security advisory addressing a critical vulnerability affecting PAN-OS. This vulnerability allows an unauthenticated attacker to execute arbitrary code with root privileges. Palo Alto observed limited exploitation of this vulnerability. It is strongly recommended updating affected appliances as soon as patches will be available, and to apply workarounds and mitigation in the meantime.

Cisco Secure Firewall Management Center Software Java Deserialization Remote Code Execution Vulnerability

Cisco Secure Email Gateway and Secure Email and Web Manager Security Hardening Release: September 2026

Cisco Secure Firewall Adaptive Security Appliance, Secure Firewall Threat Defense, and Secure Firewall Management Center Software Hardening Release: September 2026

Cisco Identity Services Engine Hardening Release: September 2026

2026-011: Critical Vulnerabilities in SAP Kernel and NetWeaver Message Server Wednesday, September 09, 2026 03:07:59 PM CEST On 8 September 2026, as part of its September Security Patch Day, SAP released Security Notes addressing two critical vulnerabilities affecting a broad range of SAP products[3]. The most severe, CVE-2026-44756 (CVSS 10.0), is a memory corruption vulnerability in SAP Extended Passport (EPP) processing, nicknamed "OVERPASS" by the Onapsis Research Labs (ORL), which discovered and responsibly disclosed it[3]. The second, CVE-2026-58240 (CVSS 9.8), nicknamed "S4GET", is a missing authentication check in the SAP NetWeaver Message Server[6]. Both are remotely exploitable without authentication. According to the reporting researchers, successful exploitation of either can result in arbitrary operating system command execution under the account that owns the SAP installation, leading to full compromise of the affected system and the business data it holds[6]. CERT-EU strongly recommends applying SAP Security Notes 3747649 and 3759472 as soon as possible.

Cisco Application Policy Infrastructure Controller Security Hardening Release: October 2026

2026-013: Critical Vulnerability in F5 BIG-IP APM Tuesday, September 22, 2026 06:52:36 PM CEST On 22 September 2026, F5 published an advisory addressing a critical vulnerability affecting its BIG-IP APM product. The vendor confirmed active exploitation in the wild. CERT-EU recommends taking appropriate actions as soon as possible.

Cisco Meraki Security Hardening Release: October 2026

Cisco NX-OS Software Security Hardening Release: October 2026

Cisco License (Smart Software Manager) On-Prem Security Hardening Release: October 2026

Cisco IOS XE Software Security Hardening Release: August 2026

Cisco IOS XR Software Security Hardening Release: September 2026

Cisco Nexus Dashboard Software Security Hardening Release: September 2026

Cisco Crosswork Security Hardening Release: August 2026

Cisco Secure Workload Software Security Hardening Release: August 2026

Cisco Catalyst SD-WAN Software Security Hardening Release: August 2026

Cisco Webex App Open Redirect Vulnerability

Cisco Webex Meetings Cross-Site Scripting Vulnerability

2026-003: Multiple Vulnerabilities in Citrix NetScaler and Citrix ADC Monday, March 23, 2026 07:03:59 PM CET On 23 March 2026, Citrix published a security advisory addressing multiple vulnerabilities affecting NetScaler ADC and NetScaler Gateway. These vulnerabilities may lead to sensitive information disclosure and user session mix-up under specific configurations. At the time of writing, there is no public evidence of active exploitation. It is strongly recommended updating affected gateways, prioritising internet-facing assets. It is also recommended to preserve evidence for further investigation.

2026-015: Critical Vulnerability in Multiple Atlassian Products Wednesday, October 07, 2026 09:52:48 AM CEST On 5 October 2026, Atlassian published a security advisory addressing a critical arbitrary file access vulnerability. It affects Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible and Fisheye. CERT-EU strongly recommends upgrading all affected installations to a fixed version as soon as possible, starting with instances accessible from the internet. CERT-EU also recommends checking access logs for signs of exploitation.

Cisco ThousandEyes Enterprise Agent BrowserBot Command Injection Vulnerability

Cisco RoomOS Security Hardening Release: July 2026