September 2, 2026 — Small Business Cyber Watch
Today’s priority: Review the newest entries in CISA’s authoritative catalog of vulnerabilities known to be exploited in the wild. The most recent catalog additions shown below are dated August 31, 2026.
PaperCut NG/MF: PaperCut NG/MF Unsafe Reflection Vulnerability
CVE-2026-82078 · Added by CISA August 31, 2026
What changed: PaperCut NG/MF contains an unsafe reflection vulnerability that allows an attacker to manipulate system configuration parameters and execute arbitrary Java bytecode residing on the application classpath under the security context of the PaperCut server process. This vulnerability can be chained with CVE-2026-81578.
Why it matters: CISA includes vulnerabilities in this catalog when there is evidence they are being actively exploited. An affected internet-facing or business-critical system deserves prompt attention.
What to do: 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. CISA remediation target: September 14, 2026.
PaperCut NG/MF: PaperCut NG/MF Missing Authentication for Critical Function Vulnerability
CVE-2026-81578 · Added by CISA August 31, 2026
What changed: PaperCut NG/MF contains a missing authentication for critical function vulnerability which allows an unauthenticated remote attacker to modify certain system configurations. This vulnerability can be chained with CVE-2026-82078.
Why it matters: CISA includes vulnerabilities in this catalog when there is evidence they are being actively exploited. An affected internet-facing or business-critical system deserves prompt attention.
What to do: 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. CISA remediation target: September 14, 2026.
ownCloud ownCloud: ownCloud Improper Authentication Vulnerability
CVE-2023-49105 · Added by CISA August 27, 2026
What changed: ownCloud contains an improper authentication vulnerability that allows an attacker to access, modify, or delete any file without authentication if the username of a victim is known, and the victim has no signing-key configured.
Why it matters: CISA includes vulnerabilities in this catalog when there is evidence they are being actively exploited. An affected internet-facing or business-critical system deserves prompt attention.
What to do: 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. CISA remediation target: August 30, 2026.
Linux Kernel: Linux Kernel Unspecified Vulnerability
CVE-2026-53362 · Added by CISA August 27, 2026
What changed: Linux Kernel contains an unspecified vulnerability that can allow for privilege escalation via IPv6 networking subsystem. This vulnerability can impact multiple products, including but not limited to Suse, Red Hat, and other products using Linux.
Why it matters: CISA includes vulnerabilities in this catalog when there is evidence they are being actively exploited. An affected internet-facing or business-critical system deserves prompt attention.
What to do: 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. CISA remediation target: August 30, 2026.
JFrog Artifactory: JFrog Artifactory Improper Limitation of a Pathname to a Restricted Directory Vulnerability
CVE-2026-66384 · Added by CISA August 27, 2026
What changed: JFrog Artifactory contains an improper limitation of a pathname to a restricted directory vulnerability. This can allow an authenticated user to write data outside the intended Docker cache path under specific remote-repository conditions.
Why it matters: CISA includes vulnerabilities in this catalog when there is evidence they are being actively exploited. An affected internet-facing or business-critical system deserves prompt attention.
What to do: 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. CISA remediation target: September 10, 2026.
Small-business action list
- Ask your IT provider whether any affected product is in your environment.
- Prioritize internet-facing, remote-access, identity, and backup systems.
- Apply vendor updates or mitigations after appropriate testing.
- Review privileged-account activity and confirm recoverable backups.
Verified source: CISA Known Exploited Vulnerabilities Catalog.
This edition is prepared automatically from CISA’s published data and provides general awareness, not an assessment of any specific organization.