Ubiquiti security advisory (AV26-498) – Update 1
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.
Serial number: AV26-498 Date: May 22, 2026 Updated: June 23, 2026 On May 21, 2026, Ubiquiti published a security advisory to address vulnerabilities in the following products. Included were critical updates for the following: Express - version 4.0.13 and prior UCG-Industrial - version 5.0.13 and prior UDM, UDM-Pro, UDM-SE, UDM-Pro-Max, EFG, UDW, UDR, UDR7, Express 7, UNVR, UNVR-Pro, UNVR-Instant, ENVR, UCG-Ultra, UCG-Max and UCG-Fiber - version 5.0.16 and prior UDM-Beast, UNAS-2, UNAS-4, UNAS-Pro, UNAS-Pro-4 and UNAS-Pro-8 - version 5.1.8 and prior UDR-5G, ENVR-Core, UCKP, UCK and UCK-Enterprise - version 5.0.17 and prior UNVR-G2 and UNVR-G2-Pro - version 5.1.11 and prior UniFi OS Server - version 5.0.6 and prior Update 1 On June 23, 2026, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-34908, CVE-2026-34909, and CVE-2026-34910 to their Known Exploited Vulnerabilities (KEV) Database. The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates. Ubiquiti UniFi - Security Advisory Bulletin 064 Ubiquiti UniFi Security Releases CISA KEV: CVE-2026-34908 CISA KEV: CVE-2026-34909 CISA KEV: CVE-2026-34910
CSIRTS triage
- What
- This advisory addresses vulnerabilities in multiple Ubiquiti products.
- Who is affected
- Users of various Ubiquiti products are affected by these vulnerabilities.
- Urgency
- Remediation is critical due to active exploitation of the vulnerabilities.
- Action
- Update to the latest versions of affected Ubiquiti products.
AI-assisted analysis generated from the source advisory — verify against the original.
Details
Original advisory: https://cyber.gc.ca/en/alerts-advisories/ubiquiti-security-advisory-av26-498
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.
- Exploitation confirmedCVE-2026-34909Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 81% of all scored CVEs.
- Exploitation confirmedCVE-2026-34910Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-34908 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34909 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34910 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- highexploitedCISA Adds Four Known Exploited Vulnerabilities to Catalogcisa
- criticalexploitedCVE-2026-34910: Ubiquiti UniFi OS Improper Input Validation Vulnerabilitycisa-kev
- criticalexploitedCVE-2026-34908: Ubiquiti UniFi OS Improper Access Control Vulnerabilitycisa-kev
- criticalexploitedCVE-2026-34909: Ubiquiti UniFi OS Path Traversal Vulnerabilitycisa-kev
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