CVE-2026-34908
Confirmed PUBLISHEDA malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized...
14 days faster than CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- May 22, 2026
- Exploitation Reported
- Jun 09, 2026
- CVSS
- 10.0 Critical
- EPSS
- 2.5%
Affected Versions
31 version rows · page 1 of 2
| Vendor | Product | Version | Status |
|---|---|---|---|
| Ubiquiti Inc |
UniFi OS Server
|
0 to < 5.0.8 |
Affected |
| Ubiquiti Inc |
UDM
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UDM-Pro
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UDM-SE
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UDM-Pro-Max
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UDM-Beast
|
0 to < 5.1.11 |
Affected |
| Ubiquiti Inc |
EFG
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UDW
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UDR
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UDR7
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UDR-5G
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
Express 7
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UNVR
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UNVR-Pro
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UNVR-Instant
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UNVR-G2
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UNVR-G2-Pro
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
ENVR
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
ENVR-Core
|
0 to < 5.1.12 |
Affected |
| Ubiquiti Inc |
UNAS-2
|
0 to < 5.1.10 |
Affected |
| Ubiquiti Inc |
UNAS-4
|
0 to < 5.1.10 |
Affected |
| Ubiquiti Inc |
UNAS-Pro
|
0 to < 5.1.10 |
Affected |
| Ubiquiti Inc |
UNAS-Pro-4
|
0 to < 5.1.10 |
Affected |
| Ubiquiti Inc |
UNAS-Pro-8
|
0 to < 5.1.10 |
Affected |
| Ubiquiti Inc |
UCKP
|
0 to < 5.1.12 |
Affected |
CVE References
- community.ui.com/releases/Security-Advisory-Bulletin-064-064/... community.ui.com · CVE Record https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| Defused Cyber First | 2026-06-09 07:27 UTC |
| CISA | 2026-06-23 00:00 UTC |
| CVE | 2026-06-23 18:11 UTC |
| All CISA Advisories | 2026-06-23 18:20 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2026-06-09 07:27:00 UTC · Defused Cyber
Proof of concept available
Recorded 2026-06-05 20:28:38 UTC · GitHub
Weaknesses (CWE)
-
Improper Access Control
Recent Mentions
All CISA Advisories · Jun 23, 2026
CISA has added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2025-67038 Lantronix EDS5000 Code Injection Vulnerability CVE-2026-34908 Ubiquiti UniFi OS Improper Access Control Vulnerability CVE-2026-34909 Ubiquiti UniFi OS Path Traversal Vulnerability CVE-2026-34910 Ubiquiti UniFi OS Improper Input Validation Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied. While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria. Aware of an exploited vulnerability not currently listed in the KEV Catalog? Submit it for potential addition through CISA’s KEV Nomination Form. Potential KEV additions must have a CVE ID, evidence of exploitation, and clear mitigation guidance.
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2026-06-05 20:28:38 UTC · 25 stars
Safely detect whether a UniFi OS Server is vulnerable to CVE-2026-34908
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
18:20 UTC 26 days ago18:20 UTC · 26 days ago
KEV confirmed by All CISA Advisories
Exploitation attested by an external source
-
18:11 UTC 26 days ago18:11 UTC · 26 days ago
KEV confirmed by CVE
Exploitation attested by an external source
-
00:00 UTC 27 days ago00:00 UTC · 27 days ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
07:27 UTC about 1 month ago07:27 UTC · about 1 month ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
20:28 UTC about 1 month ago20:28 UTC · about 1 month ago
Public PoC available
Public proof-of-concept code published
-
00:43 UTC about 2 months ago00:43 UTC · about 2 months ago
CVE published
Vulnerability disclosed publicly
-
15:00 UTC 4 months ago15:00 UTC · 4 months ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2026-34908
{
"cve_id": "CVE-2026-34908",
"title": "A malicious actor with access to the network could exploit an Improper Access...",
"affected_vendor": "Ubiquiti Inc",
"affected_product": "UniFi OS Server, UDM, UDM-Pro, UDM-SE, UDM-Pro-Max, UDM-Beast, EFG, UDW, UDR, UDR7, UDR-5G, Express 7, UNVR, UNVR-Pro, UNVR-Instant, UNVR-G2, UNVR-G2-Pro, ENVR, ENVR-Core, UNAS-2, UNAS-4, UNAS-Pro, UNAS-Pro-4, UNAS-Pro-8, UCKP, UCK, UCK-Enterprise, UCG-Ultra, UCG-Max, UCG-Fiber, UCG-Industrial",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 10.0,
"epss_score": 0.02452,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}