Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since June 23, 2026.
CVE-2026-34908
Ubiquiti UniFi OS Improper Access Control Vulnerability
Added to KEV June 23, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-34908
- CWE
- CWE-284
- Affected products
- UniFi OS · Ubiquiti UniFi OS · Ubiquiti
What happened
Ubiquiti UniFi OS contains an improper access control vulnerability which could allow a malicious actor with access to the network to make unauthorized changes to the system.
What it means for your business
Ubiquiti UniFi OS is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-34908). Ubiquiti UniFi OS contains an improper access control vulnerability which could allow a malicious actor with access to the network to make unauthorized changes to the system. CISA remediation due date: 2026-06-26. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: June 26, 2026
Sources
Related briefs
Microsoft Edge (Chromium-based) Elevation of Privilege vulnerability
Microsoft Edge (Chromium-based) Elevation of Privilege vulnerability (CVE-2026-88097) was added to Microsoft’s security update guidance. <p>Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to elevate privileges locally.</p> If you need help checking exposure, call (864) 335-9223.
Linux Kernel Out-of-Bounds Write Vulnerability
Linux Kernel is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-53266). Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. 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. CISA remediation due date: 2026-09-21. If you need help checking exposure, call (864) 335-9223.
Out of bounds memory access in V8 in Microsoft Edge vulnerability
Out of bounds memory access in V8 in Microsoft Edge vulnerability (CVE-2026-0899) was added to Microsoft’s security update guidance. Information published. If you need help checking exposure, call (864) 335-9223.
Linux Kernel Race Condition Vulnerability
Linux Kernel is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2025-39964). Linux Kernel contains a race condition vulnerability which allows concurrent writes to the same AF_ALG socket causing data to be unpredictably interleaved and creating inconsistencies in the socket's internal state. CISA remediation due date: 2026-09-21. If you need help checking exposure, call (864) 335-9223.
Need help patching?
PremierePC monitors KEV alerts for managed clients and helps teams prioritize remediation before attackers do.