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2026-004: Critical Vulnerability in SharePoint Exploited
CVE-2026-20963 (CVSS 9.8), an unauthenticated RCE in on-prem SharePoint, was added to CISA's KEV on 18 March 2026 and is actively exploited.
CERT-EU warns about CVE-2026-20963, a CVSS 9.8 unauthenticated remote code execution flaw in SharePoint caused by deserialisation of untrusted data, affecting SharePoint Server Subscription Edition, 2019, and Enterprise Server 2016. Microsoft raised the CVSS score on 17 March 2026 and the flaw entered CISA's Known Exploited Vulnerabilities catalogue on 18 March 2026. Three additional SharePoint RCE flaws (CVE-2026-26106, CVE-2026-26113, CVE-2026-26114) were fixed in the March 2026 release. CERT-EU urges immediate patching of internet-facing servers plus AMSI Full Mode, EDR deployment, ASP.NET machine key rotation, and compromise assessments.
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2026-005: High Vulnerability in the Linux Kernel ("Copy Fail")
Linux kernel flaw CVE-2026-31431 ('Copy Fail', CVSS 7.8) allows unprivileged users to gain root via AF_ALG; a public PoC is out and most distros remain unpatched.
Disclosed on 29 April 2026, CVE-2026-31431 is a local privilege escalation in the Linux kernel's algif_aead module (AF_ALG crypto API), CVSS 7.8, stemming from a 2017 in-place optimisation. By chaining an AF_ALG socket operation with splice(), an unprivileged user can write 4 bytes into an arbitrary page-cache page, e.g. corrupting a setuid binary like /usr/bin/su to obtain a root shell. It affects virtually all kernels built since 2017, including Ubuntu 20.04-24.04, Amazon Linux 2023, RHEL 10.1, and SUSE 16; the mainline fix landed 1 April 2026 but no vendor packages were available as of 30 April. CERT-EU recommends the interim mitigation (disable algif_aead) and blocking AF_ALG via seccomp, prioritising Kubernetes nodes and CI/CD runners.
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Week in review: Microsoft fixes exploited Office zero-day, Fortinet patches FortiCloud SSO flaw
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Week in review: Microsoft fixes exploited zero-day, Mirai botnets target unpatched Wazuh servers
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Ivanti EPMM vulnerabilities exploited in the wild (CVE-2025-4427, CVE-2025-4428)
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Week in review: Microsoft fixes two exploited zero-days, SOC teams are losing trust in security tools
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