Wednesday, January 28, 2026 Archive

Archived Security Snapshot

Critical vulnerabilities, curated daily for security professionals

Archived Security Brief

Yesterday's vulnerability disclosures included 22 critical-severity CVEs (CVSS 9.0+), a substantial increase from the prior day's 3 critical issues. High-priority vulnerabilities totaled 84, up 140% from 35 the previous day. Fourteen actively exploited vulnerabilities were added to the KEV catalog, including CVE-2026-20805 affecting Microsoft Windows, CVE-2026-20045 in Cisco Unified Communications Manager, and CVE-2024-37079 targeting Broadcom VMware vCenter Server. Notable critical disclosures include CVE-2026-23830 (CVSS 10.0) in SandboxJS, CVE-2025-21589 (CVSS 9.8) an authentication bypass in Juniper Networks Session Smart Router, and multiple SolarWinds Web Help Desk deserialization vulnerabilities. Patch availability currently stands at 0%, requiring organizations to prioritize compensating controls and monitoring.

  • 22 critical CVEs disclosed, up from 3 the prior day (633% increase)
  • 84 high-priority vulnerabilities identified, up 140% from 35
  • 14 actively exploited CVEs including Microsoft Windows, Cisco UCM, VMware vCenter, and Zimbra
  • 0% patch availability for disclosed vulnerabilities
  • Affected vendors include SolarWinds, Juniper Networks, Microsoft, Cisco, Broadcom, and SmarterTools

Immediate action: Organizations running Microsoft Windows, Cisco Unified Communications Manager, VMware vCenter Server, SolarWinds Web Help Desk, or Juniper Session Smart Router should assess exposure to actively exploited and critical vulnerabilities immediately. With no patches currently available, implement network segmentation, enhanced monitoring, and vendor-recommended mitigations where possible.

How to read this brief

CVSS score (e.g. 9.1) — severity from 0–10. Red marks critical (9+), orange high (7–8.9).

Exploitability — how hard the flaw is to attack, read from the CVSS vector:

  • Network / Adjacent / Local / Physical — how close an attacker must get. Network means reachable over the internet.
  • No / Low / High privileges — the access they need first. No privileges means no login required.
  • No interaction / User interaction — whether a victim has to do something (open a file, click a link). No interaction means fully automatable.

The lower the bar on all three, the easier to exploit at scale — “Network · No privileges · No interaction” is the worst case: hit from anywhere, no credentials, no victim action.

Actively exploited — confirmed under attack in the wild (CISA’s Known Exploited Vulnerabilities catalog). Prioritize these regardless of score.

EPSS · Nth percentile — FIRST.org’s estimated chance a flaw is exploited within 30 days. We flag it only in the top 10% — a statistical signal it’s unusually likely to be targeted, separate from whether attacks are confirmed.

💡 Tip: Swipe CVE cards left to ⭐ star, right to ❌ remove

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