This Week in Threats: Jun 23–Jul 07, 2026

Weekly Threat Summary

8 vulnerabilities were added to the CISA Known Exploited Vulnerabilities (KEV) catalog this period. The highest CVSS score is 10.0.

This week includes 5 critical-severity vulnerabilities (CVSS 9.0+) that require immediate attention.

This Week's Vulnerabilities

CVE-2026-48558 — SimpleHelp Authentication Bypass Vulnerability

• CVSS Score: 10.0 (CRITICAL)
• Date Added: 2026-06-29
• Description: SimpleHelp contains an authentication bypass vulnerability in the OIDC authentication flow. When OIDC authentication...
• Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CVE-2026-34908 — Ubiquiti UniFi OS Improper Access Control Vulnerability

• CVSS Score: 10.0 (CRITICAL)
• Date Added: 2026-06-23
• Description: Ubiquiti UniFi OS contains an improper access control vulnerability which could allow a malicious actor with access...
• Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CVE-2026-34909 — Ubiquiti UniFi OS Path Traversal Vulnerability

• CVSS Score: 10.0 (CRITICAL)
• Date Added: 2026-06-23
• Description: Ubiquiti UniFi OS contains a path traversal vulnerability which could allow a malicious actor with access to the...
• Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CVE-2026-12569 — PTC Windchill and FlexPLM Improper Input Validation Vulnerability

• CVSS Score: 9.8 (CRITICAL)
• Date Added: 2026-06-25
• Description: PTC Windchill and FlexPLM contains an improper input validation vulnerability allowing an unauthenticated, remote...
• Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CVE-2025-67038 — Lantronix EDS5000 Code Injection Vulnerability

• CVSS Score: 9.8 (CRITICAL)
• Date Added: 2026-06-23
• Description: Lantronix EDS5000 contains a code injection vulnerability that could allow attackers to inject arbitrary OS commands...
• Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CVE-2026-45659 — Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability

• CVSS Score: 8.8 (HIGH)
• Date Added: 2026-07-01
• Description: Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized...
• Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CVE-2026-20230 — Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability

• CVSS Score: 8.6 (HIGH)
• Date Added: 2026-06-25
• Description: Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management...
• Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CVE-2026-34910 — Ubiquiti UniFi OS Improper Input Validation Vulnerability

• CVSS Score: None (LOW)
• Date Added: 2026-06-23
• Description: Ubiquiti UniFi OS contains an improper input validation vulnerability which could allow a malicious actor with...
• Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

What This Means for You

If you run any of the affected products, patch immediately. Critical-severity vulnerabilities are actively exploited in the wild — CISA adds them to the KEV catalog specifically because they represent real, current threats.

Use the CVSS Calculator to assess how these scores apply to your specific environment.

Cert Study Angles

These CVEs map directly to certification exam objectives. Use them as real-world case studies:

CompTIA Security+

• CVE-2026-48558 → D2 Threats & Vulnerabilities
• CVE-2026-34908 → D1 General Security Concepts
• CVE-2025-67038 → D2 Threats & Vulnerabilities
• CVE-2026-45659 → D2 Threats & Vulnerabilities

ISC2 CISSP

• CVE-2026-48558 → D5 IAM, D6 Security Assessment
• CVE-2026-34908 → D5 IAM, D6 Security Assessment
• CVE-2026-34909 → D6 Security Assessment
• CVE-2026-12569 → D6 Security Assessment
• CVE-2025-67038 → D6 Security Assessment
• CVE-2026-45659 → D6 Security Assessment
• CVE-2026-20230 → D6 Security Assessment
• CVE-2026-34910 → D6 Security Assessment

See all CVEs mapped to your cert: Exploit Tracker

Tools to Help

• CVSS Calculator — Score these vulnerabilities for your specific environment
• Exploit Tracker — Filter KEV vulnerabilities by certification relevance
• Study Tracker — Track your exam objective completion
• Security+ Practice Quiz — Test your knowledge of vulnerability types and mitigations

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