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Cyber Threats Daily2026-10-21October 21, 2026

CISA KEV Catalog Expands by 50: SiteGuard RCE Leads, Nine Deadlines Already Lapsed

// Summary

CISA added 50 CVEs to the Known Exploited Vulnerabilities (KEV) catalog across this reporting window, with the newest batch landing 2026-10-20 led by a root/SYSTEM-level OS command injection in EG Secure Solutions SiteGuard Server Edition. A four-CVE Plex Media Server exploit chain also entered KEV the same day. Nine previously-added CVEs — spanning BeyondTrust, Fortinet, Atlassian, Ahsay, Cisco, Palo Alto Networks, Ivanti, and Microsoft — now have BOD 26-04 remediation deadlines that have already passed as of today; agencies still unpatched are out of compliance.

Total additions (this run)50
Detailed below40
Deadlines already lapsed9
Due within 48 hours3
Known ransomware use flagged0 (all marked "Unknown" in source)
// Lead: Newest Additions (2026-10-20)
SiteGuard OS Command Injection
IDCVE-2026-106931
ManufacturerEG Secure Solutions
ProductSiteGuard Server Edition
ReasonOS command injection enabling arbitrary command execution with root/SYSTEM privileges
Due2026-10-23

Root/SYSTEM-level command execution with a 48-hour patch window — this is today's top priority for any organization running SiteGuard.

Plex Media Server Exploit Chain
IDCVE-2026-96656 (file path control), CVE-2026-96655 (SSRF via transcode endpoint), CVE-2026-96654 (encoded URI scheme neutralization), CVE-2026-96652 (SSRF via protocol parameter)
ManufacturerPlex
ProductMedia Server
ReasonFour chainable vulnerabilities allowing an admin user to write and execute arbitrary files, with SSRF enabling attacker-controlled POST requests
DueCVE-2026-96656 and CVE-2026-96654 due 2026-10-23; CVE-2026-96655 and CVE-2026-96652 due 2026-11-03

CISA explicitly notes these four are chainable — treat as a single exploitation path rather than isolated bugs. Prioritize patching all four together.

Siemens Software Center DLL Hijack
IDCVE-2026-110936
ManufacturerSiemens
ProductSoftware Center
ReasonUncontrolled search path element allows local DLL hijacking for code execution
Due2026-11-03
// Overdue: BOD 26-04 Deadlines Already Passed

These nine entries carried remediation deadlines on or before 2026-10-19 — federal stakeholders should confirm remediation status and document any exceptions immediately.

BeyondTrust Remote Support Auth Bypass
IDCVE-2026-102764 | Due: 2026-10-19 | Reason: Spoofing-based auth bypass enabling remote file operations on the appliance
Fortinet Multiple Products Path Traversal
IDCVE-2025-61624 | Product: FortiOS, FortiPAM, FortiProxy, FortiSwitchManager | Due: 2026-10-19
Atlassian Multiple Products Exposure
IDCVE-2026-21589 | Product: Bitbucket, Confluence, Jira Service Management/Software, Bamboo, Crowd DC, Crucible, Fisheye | Due: 2026-10-18
Ahsay AhsayCBS Chain (Command Injection + Auth Bypass)
IDCVE-2026-105134, CVE-2026-105133 | Due: 2026-10-17 | Reason: Auth bypass chained with command injection via the Replication Receiver API
Cisco Secure Email Gate
CISA KEV Catalog Expands by 50: SiteGuard RCE Leads, Nine Deadlines Already Lapsed · Cyber Threats Daily