2026-004: Critical Vulnerability in SharePoint Exploited Wednesday, March 25, 2026 08:51:39 AM CET On 17 March 2026, Microsoft updated one of its January 2026 security advisories related to a remote code execution vulnerability in Microsoft SharePoint. Specifically, Microsoft raised the CVSS score and changed the FAQ section to indicate that the vulnerability could be exploited by an unauthenticated attacker. This vulnerability was added in the CISA's Known Exploited Vulnerabilities (KEV) catalogue on 18 March 2026. Additionally, three further RCE flaws affecting Microsoft SharePoint were addressed in the March 2026 release. CERT-EU strongly recommends updating SharePoint servers as soon as possible, prioritising internet-facing assets. CERT-EU also encourages IT administrators to take necessary remediation actions.

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.

2026-012: Critical Vulnerabilities in Check Point Products Thursday, September 10, 2026 10:20:06 AM CEST On 9 September 2026, Check Point released emergency security updates addressing two critical vulnerabilities affecting Check Point Security Gateway, Security Management Server, and Spark Firewall deployments configured to use Remote Access VPN or Site-to-Site VPN. Both vulnerabilities carry a CVSS score of 9.8 and could allow an unauthenticated, remote attacker to execute arbitrary code on affected appliances. CERT-EU strongly recommends applying the available hotfixes as soon as possible, prioritising internet-facing and perimeter appliances.

Cisco Secure Email Gateway SQL Injection Vulnerability

2026-016: Critical Vulnerability in GitLab CE and EE Monday, October 12, 2026 02:57:02 PM CEST On 12 October 2026, GitLab released versions 19.4.2, 19.3.4 and 19.2.8 of GitLab Community Edition (CE) and Enterprise Edition (EE), fixing 24 security issues among which a critical vulnerability that could allow an unauthenticated attacker to execute arbitrary code on the server. CERT-EU strongly recommends upgrading self-managed GitLab CE/EE instances to a fixed version as soon as possible, starting with internet-facing instances.

2026-007: Critical Vulnerability in Windows Netlogon Wednesday, June 10, 2026 08:47:08 AM CEST On 12 May 2026, Microsoft published a security advisory addressing a critical vulnerability affecting Windows Server when acting as a domain controller. This vulnerability allows an unauthenticated attacker to execute arbitrary code over a network. According to The Centre for Cybersecurity Belgium (CCB), this vulnerability is currently exploited by threat actors. It is strongly recommended updating affected Windows servers as soon as possible.

Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

Cisco NX-OS Software NX-API Remote Code Execution Vulnerability

Cisco Nexus 3000 and 9000 Series Switches MPLS OAM Remote Code Execution Vulnerability

Cisco Nexus 3000 and 9000 Series Switches NGOAM Remote Code Execution Vulnerabilities

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 Authentication Bypass Vulnerability

Cisco Identity Services Engine Vulnerabilities

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

Cisco Nexus 9000 Series Switches Silicon One Remote Code Execution Vulnerability

Cisco Unified Communications Manager Server-Side Request Forgery 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

2026-002: Multiple Vulnerabilities in Cisco Products Thursday, February 26, 2026 07:38:52 PM CET On 25 February 2026, Cisco released security advisories addressing multiple high and critical severity vulnerabilities in Cisco Catalyst SD-WAN controllers and Cisco SD-WAN Manager. If exploited, these vulnerabilities could allow attackers to gain administrative access to compromised systems. It is recommended to capture forensic evidence, hunt for indicators of compromise, and apply updates as soon as possible. One of the vulnerabilities, CVE-2026-20127, is exploited in the wild since 2023.

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

Cisco Secure Firewall Management Center Software Vulnerabilities

Cisco Identity Services Engine Remote Code Execution and Information Disclosure Vulnerabilities