This Week in Threats: Sep 29–Oct 13, 2026

Weekly Threat Summary

11 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-2015-3306: ProFTPD Improper Access Control Vulnerability

• CVSS Score: 10.0 (CRITICAL)
• Date Added: 2026-10-08
• Description: ProFTPD contains an improper access control vulnerability that could allow remote attackers to read and write to...
• 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-2021-3199: ONLYOFFICE Docs Server Path Traversal Vulnerability

• CVSS Score: 9.8 (CRITICAL)
• Date Added: 2026-10-08
• Description: ONLYOFFICE Docs contains a path traversal vulnerability that can occur when JWT is used, via a /.. sequence in an...
• 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-2026-102489: Zammad GmbH Zammad Session Fixation Vulnerability

• CVSS Score: 9.8 (CRITICAL)
• Date Added: 2026-10-02
• Description: Zammad GmbH Zammad contains a session fixation vulnerability that can lead to remote code execution as the zammad...
• 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-2026-102490: Zammad GmbH Zammad Improper Privilege Management Vulnerability

• CVSS Score: 9.8 (CRITICAL)
• Date Added: 2026-10-02
• Description: Zammad GmbH Zammad contains an improper privilege management vulnerability that can allow the local zammad user to...
• 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-2026-76504: Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability

• CVSS Score: 9.8 (CRITICAL)
• Date Added: 2026-09-30
• Description: Cisco Catalyst SD-WAN Manager contains a hex encoding vulnerability that could allow 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-2026-86950: Apple Multiple Products Out-of-Bounds Write Vulnerability

• CVSS Score: 8.8 (HIGH)
• Date Added: 2026-09-29
• Description: Apple iOS, macOS, and iPadOS contain an out-of-bounds write vulnerability in CoreGraphics that may lead to arbitrary...
• 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-2016-3081: Apache Struts Command Injection Vulnerability

• CVSS Score: 8.1 (HIGH)
• Date Added: 2026-10-08
• Description: Apache Struts contains a command injection vulnerability that could allow remote attackers to execute arbitrary code...
• 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-2015-5477: ISC BIND Data Processing Errors Vulnerability

• CVSS Score: 7.5 (HIGH)
• Date Added: 2026-10-08
• Description: ISC BIND contains a data processing errors vulnerability that could allow remote attackers to cause a denial of...
• 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-2026-88779: Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

• CVSS Score: 7.5 (HIGH)
• Date Added: 2026-10-04
• Description: Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an...
• 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-2023-22894: Strapi Cleartext Storage of Sensitive Information Vulnerability

• CVSS Score: 4.9 (MEDIUM)
• Date Added: 2026-10-08
• Description: Strapi contains a cleartext storage of sensitive information vulnerability that could allow attackers with access to...
• 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-2026-104286: Fortinet FortiMail Path Traversal Vulnerability

• CVSS Score: None (LOW)
• Date Added: 2026-10-01
• Description: Fortinet FortiMail contains a path traversal and an improper neutralization of NULL byte or NULL character...
• 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. Every vulnerability in this roundup is in CISA’s KEV catalog, which lists only flaws with confirmed exploitation in the wild.

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-2015-3306 → D1 General Security Concepts
• CVE-2026-102489 → D2 Threats & Vulnerabilities
• CVE-2016-3081 → D2 Threats & Vulnerabilities

ISC2 CISSP

• CVE-2015-3306 → D5 IAM, D6 Security Assessment
• CVE-2021-3199 → D6 Security Assessment
• CVE-2026-102489 → D6 Security Assessment
• CVE-2026-102490 → D6 Security Assessment
• CVE-2026-76504 → D6 Security Assessment
• CVE-2026-86950 → D6 Security Assessment
• CVE-2016-3081 → D6 Security Assessment
• CVE-2015-5477 → D6 Security Assessment
• CVE-2026-88779 → D6 Security Assessment
• CVE-2023-22894 → D6 Security Assessment, D8 Software Development
• CVE-2026-104286 → D6 Security Assessment

Cisco CCNA

• CVE-2026-86950 → D1 Network Fundamentals

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

Stay Updated

This roundup is published every Tuesday. Bookmark the FixTheVuln Blog to stay on top of the latest threats, or subscribe via RSS.