CVE-2026-34909 (GCVE-0-2026-34909)
Vulnerability from cvelistv5 – Published: 2026-05-22 00:43 – Updated: 2026-06-24 03:56Summary
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to access an underlying account.
Severity
10 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-23 00:00 UTC
CWE
- CWE-22 - Path Traversal
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
32 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Ubiquiti Inc | UniFi OS Server |
Affected:
0 , < 5.0.8
(semver)
|
guessed | |
| Ubiquiti Inc | Express |
Affected:
0 , < 4.0.14
(semver)
|
guessed | |
| Ubiquiti Inc | UDM |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UDM-Pro |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UDM-SE |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UDM-Pro-Max |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UDM-Beast |
Affected:
0 , < 5.1.11
(semver)
|
guessed | |
| Ubiquiti Inc | EFG |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UDW |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UDR |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UDR7 |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UDR-5G |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | Express 7 |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UNVR |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UNVR-Pro |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UNVR-Instant |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UNVR-G2 |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UNVR-G2-Pro |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | ENVR |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | ENVR-Core |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UNAS-2 |
Affected:
0 , < 5.1.10
(semver)
|
guessed | |
| Ubiquiti Inc | UNAS-4 |
Affected:
0 , < 5.1.10
(semver)
|
guessed | |
| Ubiquiti Inc | UNAS-Pro |
Affected:
0 , < 5.1.10
(semver)
|
guessed | |
| Ubiquiti Inc | UNAS-Pro-4 |
Affected:
0 , < 5.1.10
(semver)
|
guessed | |
| Ubiquiti Inc | UNAS-Pro-8 |
Affected:
0 , < 5.1.10
(semver)
|
guessed | |
| Ubiquiti Inc | UCKP |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UCK |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UCK-Enterprise |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UCG-Ultra |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UCG-Max |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UCG-Fiber |
Affected:
0 , < 5.1.12
(semver)
|
guessed | |
| Ubiquiti Inc | UCG-Industrial |
Affected:
0 , < 5.1.12
(semver)
|
guessed |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ae12d4e6-8e25-4665-9581-2d437ce5b644
Exploited: Yes
Timestamps
First Seen: 2026-06-23
Asserted: 2026-06-23
Scope
Notes: KEV entry: Ubiquiti UniFi OS Path Traversal Vulnerability | Affected: Ubiquiti / UniFi OS | Description: Ubiquiti UniFi OS contains a path traversal vulnerability which could allow a malicious actor with access to the network to access files on the underlying system that could be manipulated to access an underlying account. | 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-2026-34909
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-22 |
|---|---|
| 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 Path Traversal Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-06-23 18:00 UTC
| Updated: 2026-06-23 18:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: de3af882-4d92-4a98-a92c-c025d4818825
Exploited: Yes
Timestamps
First Seen: 2026-06-09
Asserted: 2026-06-09
Scope
Notes: KEVIntel entry: A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the... | Affected: Ubiquiti Inc / UniFi OS Server, Express, 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: 0.00623 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the... |
| Vendor | Ubiquiti Inc |
| Product | UniFi OS Server, Express, 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 | 2026-06-09T07:29:00.000Z |
| Cvss Score | 10.0 |
| Epss Score | 0.00623 |
| Cvss Severity | CRITICAL |
| Epss Percentile | 0.45095 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | True |
References
Created: 2026-06-23 14:02 UTC
| Updated: 2026-07-10 06:14 UTC
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"product": "UCG-Industrial",
"vendor": "Ubiquiti Inc",
"versions": [
{
"lessThan": "5.1.12",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to access an underlying account."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 10,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-22",
"description": "CWE-22 Path Traversal",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-22T20:19:51.649Z",
"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"shortName": "hackerone"
},
"references": [
{
"url": "https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"assignerShortName": "hackerone",
"cveId": "CVE-2026-34909",
"datePublished": "2026-05-22T00:43:49.072Z",
"dateReserved": "2026-03-31T15:00:06.521Z",
"dateUpdated": "2026-06-24T03:56:19.760Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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