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CRITICAL: Microsoft Defender privilege escalation (CVE-2026-41091) actively exploited in the wild◆HIGH: 9-year-old Linux kernel flaw (CVE-2026-46333) enables unprivileged root execution on major distros◆HIGH: Cisco Secure Workload max-severity RCE grants Site Admin privileges via REST API◆HIGH: Showboat Linux malware + JFMBackdoor target telcos across Middle East and Central Asia◆MED: Google accidentally exposed unfixed Chromium RCE; JavaScript persistence in closed browser◆HIGH – GitHub: 3,800+ internal repos stolen by TeamPCP; no customer data impact confirmed◆HIGH – SonicWall Gen6 VPN: MFA bypass via incomplete patching; ransomware deployment confirmed◆HIGH – Drupal: Critical core security release with hours-to-exploit window◆CRITICAL: Microsoft Defender privilege escalation (CVE-2026-41091) actively exploited in the wild◆HIGH: 9-year-old Linux kernel flaw (CVE-2026-46333) enables unprivileged root execution on major distros◆HIGH: Cisco Secure Workload max-severity RCE grants Site Admin privileges via REST API◆HIGH: Showboat Linux malware + JFMBackdoor target telcos across Middle East and Central Asia◆MED: Google accidentally exposed unfixed Chromium RCE; JavaScript persistence in closed browser◆HIGH – GitHub: 3,800+ internal repos stolen by TeamPCP; no customer data impact confirmed◆HIGH – SonicWall Gen6 VPN: MFA bypass via incomplete patching; ransomware deployment confirmed◆HIGH – Drupal: Critical core security release with hours-to-exploit window◆
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● HIGH/ MAY 22, 2026TODAY’S BRIEFING — #065

Critical RCEs: Microsoft Defender, Linux kernel, Cisco Workload; Showboat targets telcos

Microsoft Defender vulnerabilities actively exploited; 9-year-old Linux kernel flaw enables root execution; Cisco Workload max-severity RCE patched; Showboat malware targets telcos across Middle East and Central Asia.

CVE-2026-41091Microsoft Malware Protection Engine — Privilege escalation; actively exploited; CVSS 7.8CVE-2026-46333Linux Kernel — Improper privilege management enabling root execution; disclosed after 9-year dormancy; CVSS 5.5CVE-2026-9082Drupal — Unauthenticated RCE, privilege escalation, information disclosure; highly critical
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65 briefings published
9 vuln reports
59 tools indexed
$0 for security teams
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Critical vulnerabilities

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CVEProductCVSSExploitedPatch
CVE-2026-42156Funnel Builder WordPress Plugin9.3in wild✓ available
CVE-2026-42945NGINX Open Source & NGINX Plus9.2in wild✓ available
CVE-2026-43521Cisco SD-WAN Systems9.1in wild✓ available
CVE-2026-42139Siemens gWAP (gPROMS Web Applications Publisher)8.9—✓ available
CVE-2026-41289Universal Robots Polyscope 58.8—✓ available

KEV = listed in CISA catalog · IN WILD = active exploitation reported

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1Password
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Cloudflare Zero Trust
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Tailscale
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WireGuard
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Zscaler Private Access
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Burp Suite
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Nmap
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sqlmap
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