CVE-2026-34908: Ubiquiti UniFi OS Improper Access Control Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.
CSIRTS triage
- What
- An improper access control vulnerability could allow unauthorized changes to the system.
- Who is affected
- Malicious actors with access to the network using Ubiquiti UniFi OS.
- Urgency
- Remediation is critical as exploitation is possible and the vulnerability is severe.
- Action
- Apply the latest security updates provided by Ubiquiti.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-34908
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-34908Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 82% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-34908 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- criticalexploitedUbiquiti security advisory (AV26-498) – Update 1cccs
- highexploitedCISA Adds Four Known Exploited Vulnerabilities to Catalogcisa
Recent advisories for Ubiquiti UniFi OS
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalexploitedCVE-2026-34910: Ubiquiti UniFi OS Improper Input Validation Vulnerabilitycisa-kev · 2026-06-23
- criticalexploitedCVE-2026-34909: Ubiquiti UniFi OS Path Traversal Vulnerabilitycisa-kev · 2026-06-23
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