August 31, 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 27, 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.
Ajax.NET Professional Ajax.NET Professional: Ajax.NET Professional Deserialization of Untrusted Data Vulnerability
CVE-2021-23758 · Added by CISA August 26, 2026
What changed: Ajax.NET Professional (AjaxPro) contains a deserialization of untrusted data vulnerability that could allow for remote code execution via arbitrary .NET classes. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.
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 9, 2026.
Red Hat Libuser: Red Hat Libuser Race Condition Vulnerability
CVE-2015-3246 · Added by CISA August 26, 2026
What changed: Red Hat libuser contains a race condition vulnerability that allows authenticated local users to corrupt the /etc/passwd file to cause a denial of service or privilege escalation.
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 9, 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.