CVE-2026-34908 (GCVE-0-2026-34908)
Vulnerability from cvelistv5 – Published: 2026-05-22 00:43 – Updated: 2026-06-24 03:55Summary
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.
Severity
10 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-22 00:00 UTC
CWE
- CWE-284 - Improper Access Control - Generic
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://community.ui.com/releases/Security-Adviso… | |
| https://www.pwndefend.com/2026/06/09/cve-2026-349… | third-party-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
31 products
| Vendor | Product | Version | |
|---|---|---|---|
| Ubiquiti Inc | UniFi OS Server |
Affected:
0 , < 5.0.8
(semver)
|
|
| Ubiquiti Inc | UDM |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-Pro |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-SE |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-Pro-Max |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-Beast |
Affected:
0 , < 5.1.11
(semver)
|
|
| Ubiquiti Inc | EFG |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDW |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDR |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDR7 |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDR-5G |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | Express 7 |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-Pro |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-Instant |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-G2 |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-G2-Pro |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | ENVR |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | ENVR-Core |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNAS-2 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-4 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-Pro |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-Pro-4 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-Pro-8 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UCKP |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCK |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCK-Enterprise |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Ultra |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Max |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Fiber |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Industrial |
Affected:
0 , < 5.1.12
(semver)
|
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 11d521ea-2876-43d8-bbda-83348d1fcadd
Exploited: Yes
Timestamps
First Seen: 2026-06-23
Asserted: 2026-06-23
Scope
Notes: Ubiquiti UniFi OS Improper Access Control Vulnerability | Affected: Ubiquiti / UniFi OS | Description: 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. | 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. | Due date: 2026-06-26 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-34908
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-284 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | UniFi OS |
| Due Date | 2026-06-26 |
| Date Added | 2026-06-23 |
| Vendorproject | Ubiquiti |
| Vulnerabilityname | Ubiquiti UniFi OS Improper Access Control Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-10-02 08:09 CEST
| Updated: 2026-10-02 08:09 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6d6f6832-ade7-4504-b27a-69f5cf5c6f74
Exploited: Yes
Timestamps
First Seen: 2026-06-09
Asserted: 2026-06-09
Scope
Notes: A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized... | Affected: Ubiquiti / 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 | CVSS: 10.0 (CRITICAL) | EPSS: 0.15207 | Used in malware: unknown | Listed 14 days ahead of CISA KEV | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized... |
| Cve Id | CVE-2026-34908 |
| Vendor | Ubiquiti |
| Ghsa Id | GHSA-P8C5-XWRC-584F |
| 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 |
| Added Date | 2026-06-09T07:27:00.000Z |
| Cvss Score | 10.0 |
| Epss Score | 0.15207 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.96655 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2026-34908 |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:09 CEST
| Updated: 2026-10-02 09:09 CEST
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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