How severe is CVE-2026-34908?

CVE-2026-34908 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34908 being actively exploited?

Yes. CVE-2026-34908 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-06-23, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-34908?

CVE-2026-34908 primarily affects Ui Unifi Os Server. In total, 31 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-34908?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2026-34908 have an EU (EUVD) identifier?

Yes. CVE-2026-34908 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31383. It is also flagged as exploited in the EUVD (since 2026-06-23).

When was CVE-2026-34908 published?

CVE-2026-34908 was published on 2026-05-22 and last updated on 2026-07-23.

CVE-2026-34908

CVE-2026-34908 is a critical-severity vulnerability in Ui Unifi Os Server with a CVSS 3.x base score of 10.0. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-06-23). The underlying weakness is classified as CWE-284.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
EPSS exploit prediction: 85% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-06-23)
EU (EUVD) id: EUVD-2026-31383
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-06-23)
Weakness: CWE-284
Affected product: Ui Unifi Os Server
Published: 2026-05-22
Last modified: 2026-07-23

Description

A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized changes to the system.

Frequently asked questions

What is CVE-2026-34908?: A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized changes to the system.
How severe is CVE-2026-34908?: CVE-2026-34908 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34908 being actively exploited?: Yes. CVE-2026-34908 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-06-23, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-34908?: CVE-2026-34908 primarily affects Ui Unifi Os Server. In total, 31 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-34908?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-34908 have an EU (EUVD) identifier?: Yes. CVE-2026-34908 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31383. It is also flagged as exploited in the EUVD (since 2026-06-23).
When was CVE-2026-34908 published?: CVE-2026-34908 was published on 2026-05-22 and last updated on 2026-07-23.

References

Affected products (31)

cpe:2.3:a:ui:unifi_os_server:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_cloud_gateway_industrial_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_dream_machine_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_dream_machine_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_dream_machine_special_edition_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_dream_machine_pro_max_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:enterprise_fortress_gateway_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_dream_wall_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_dream_router_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_dream_router_7_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_express_7_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_network_video_recorder_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_network_video_recorder_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_network_video_recorder_instant_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:enterprise_network_video_recorder_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_cloud_gateway_ultra_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_cloud_gateway_max_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_cloud_gateway_fiber_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_dream_router_5g_max_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:enterprise_network_video_recorder_core_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_cloud_key_plus_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_cloudkey_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_cloudkey_enterprise_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_network_video_recorder_g2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_network_video_recorder_g2_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unifi_dream_machine_beast_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unas_2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unas_4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unas_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unas_pro_4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:unas_pro_8_firmware:*:*:*:*:*:*:*:*

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