Evidence dossier

CVE-2026-34909

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…

Exploited in the wild (CISA KEV since Jun 23, 2026). hackerone reports CVSS 3.1 10.0. EPSS estimates 63.9% exploit likelihood as of Aug 27, 2026.

81.0–95.0Priority evidence range

Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

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.

State: PUBLISHED
Published: May 22, 2026
Updated: Jun 24, 2026
Evidence coverage: 85%

Evidence chronology

What was known when

Download this view's receipt →

Source dateSource date omittedFirst observed by CASCAJul 19, 2026
CISA-ADP
Record text: CISA ADP Vulnrichment
Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Original evidence ↗
Source dateSource date omittedFirst observed by CASCAJul 19, 2026
hackerone
Record text: 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.
Inspect raw assertion
Field
container
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.
Original evidence ↗
Source dateJul 16, 2026First observed by CASCAJul 19, 2026
CISA KEV
Exploitation cataloged: Ubiquiti UniFi OS Path Traversal Vulnerability
Inspect raw assertion
Field
observed_exploitation
Value
Ubiquiti UniFi OS Path Traversal Vulnerability
Original evidence ↗
Source dateAug 27, 2026First observed by CASCAAug 27, 2026
FIRST EPSS
EPSS score: 63.9% probability · 99.16th percentile
Inspect raw assertion
Field
model_probability
Value
Probability 0.638970000000; percentile 0.991600000000
Original evidence ↗

ExploitationCatalog member

CISA KEV · catalog date Jun 23, 2026 · first observed Jul 19, 2026

Exploit likelihood63.90%

FIRST EPSS · score date Aug 27, 2026 · 99.2th percentile · first observed Aug 27, 2026

SeverityCVSS 10.0

hackerone · CVSS 3.1 · first observed Jul 19, 2026 · same-version scores align in this snapshot

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1

Exploitation statusEvidence supported

Eligible evidence is present for this bounded claim.

Revision: evidence-policy-v1.1.0
Cutoff: Aug 27, 2026
Resolution: None

Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision: evidence-policy-v1.1.0
Cutoff: Aug 27, 2026
Resolution: None

Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision: casca-direct-cvss-eligibility-v1
Cutoff: Aug 27, 2026
Resolution: None

Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision: casca-factor-d-obligations-v1
Cutoff: Aug 27, 2026
Resolution: Resolve identity

Source comparison

Who said what

CISA-ADPIndependent enrichment

Record text

CISA ADP Vulnrichment

Inspect raw assertion

Field: container
Value: CISA ADP Vulnrichment

Source dateSource date omittedFirst observed by CASCAJul 19, 2026Original evidence ↗

hackeroneOriginal assertion

Record text

Inspect raw assertion

Field: container
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.

Source dateSource date omittedFirst observed by CASCAJul 19, 2026Original evidence ↗

CISA KEVOriginal assertion

Exploitation cataloged

Ubiquiti UniFi OS Path Traversal Vulnerability

Inspect raw assertion

Field: observed_exploitation
Value: Ubiquiti UniFi OS Path Traversal Vulnerability

Source dateJul 16, 2026First observed by CASCAJul 19, 2026Original evidence ↗

FIRST EPSSOriginal assertion

EPSS score

63.9% probability · 99.16th percentile

Inspect raw assertion

Field: model_probability
Value: Probability 0.638970000000; percentile 0.991600000000

Source dateAug 27, 2026First observed by CASCAAug 27, 2026Original evidence ↗

Applicability

Cited product scope

Trace impact →

63Underlying assertions

63Canonical products

32Target assertions

31Constraint assertions

Grouped from 63 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries

Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

Search scopeRoleOfficial link state

95 scope groups

hackerone · source assertedUbiquiti IncEFGDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncENVRDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncENVR-CoreDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncExpressDirect source scope

Affected: 0 to before 4.0.14 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "4.0.14", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncExpress 7Direct source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUCG-FiberDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUCG-IndustrialDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUCG-MaxDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUCG-UltraDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUCKDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUCK-EnterpriseDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUCKPDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUDMDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUDM-BeastDirect source scope

Affected: 0 to before 5.1.11 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.11", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUDM-ProDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUDM-Pro-MaxDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUDM-SEDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUDRDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUDR-5GDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUDR7Direct source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUDWDirect source scope

Affected: 0 to before 5.1.12 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.12", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUNAS-2Direct source scope

Affected: 0 to before 5.1.10 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.10", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUNAS-4Direct source scope

Affected: 0 to before 5.1.10 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.10", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUNAS-ProDirect source scope

Affected: 0 to before 5.1.10 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.10", "versionType": "semver"}]

hackerone · source assertedUbiquiti IncUNAS-Pro-4Direct source scope

Affected: 0 to before 5.1.10 (semver comparison)

Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion

[{"status": "affected", "version": "0", "lessThan": "5.1.10", "versionType": "semver"}]

Affected-product evidence

Accepted scope and product mapping

0 canonical links · 2 source-reported links

Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class: Direct cve affected
Assertions: 32
Mapping revision: cpe23-exact-mapping-v1
Observed cutoff: Aug 27, 2026

Retained assertion IDs

019da9f1-f40e-48e1-98e0-e7aaba21af710272a044-50de-4775-9e17-56cc172db3ae07121bdb-04fd-4153-ac70-32f4992ce2a907b1d4c3-1420-4e64-a565-5ee38c153720096c6cca-fd11-47fc-88d1-0363f684a8302593029f-b4f0-449d-a8ca-4d06e60583d3291e2b0d-18d4-4a97-9f49-1eb276ea572729d89004-d948-48e0-995b-1eaa97a044372db89406-acc0-4b52-80a7-54995fdb582231145851-6376-49ff-9a87-6bfa2de5a578373f2110-d4a3-4166-bfa4-890adf5644855b08a4bb-689d-4c70-bdcb-41eb1120031b5dba78fe-69e6-4cb3-9ac9-bb8b22fe6e4f63fa0e81-9a00-4d4b-b992-c56d6de70180646d13ba-6eb2-40fa-9f10-95a10522839a67b3e782-b4d8-44fe-a717-ebb40212976e775d7b45-129d-41d2-b46b-e22b2920c420902773e2-da0c-47b1-95e6-88b709ee11e4952ba8a9-842e-4e30-86e0-65ee323bdfda96843d61-dd60-4a71-b36c-b1424707b6f59bf781ce-4bd7-4a56-9a16-fda33def41ce9dd1edf6-82e9-40fc-9e1f-f9ef6a15a109a0c4cee3-c91d-4f47-87e6-6e9898ecf671a9a942ba-b0bb-4791-8824-d4f77eeb93c7abde3f20-a382-48b7-a2e7-85037f6033acad14f9fc-9385-4b57-bfac-e4b93656c9e2be6c5f45-e025-47df-9563-cc3ea3f8f9ebcbb39d17-6936-4402-8cbb-e1cd361c9dbccde62d15-e4e2-4b36-b9a2-bdbe64828f00e2dbb338-658b-455d-a599-1a40bcb9b35be9932036-e450-4a3b-85f4-d672fa8ffb96fa216b91-abf3-407c-b241-97ed594f2374

Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class: Nvd cpe vulnerable target
Assertions: 32
Mapping revision: cpe23-exact-mapping-v1
Observed cutoff: Aug 27, 2026

Retained assertion IDs

08a9b199-29e4-42e5-93ee-9ce0916d94320bc6f2fc-f1d9-4754-bdf8-39ee1c40c074129bd897-a39e-4ccb-b96e-3380258c9ac6277ae690-df64-43d1-a87d-a2c8d431ffc92bc06503-1ee7-4db6-b192-b0c997a15092348d13bb-1928-4dfd-a12c-93059fd912b53b0dce1e-7a32-4775-af92-529bec9000a54116a51b-f9cb-450b-8c64-6c7b17d08ec745fc409e-f605-48d7-915f-d937577e96c848897657-f284-4ef6-b413-7a9026ff77fd4cd9eae4-5a1c-4e34-8df6-96ba3c346b6b5022ce4b-bbc3-4d8a-bfa6-5330e44edf295395422a-92e5-4481-ba8d-e7a258e1858c5f56adb7-c3c9-4eb2-af2f-fdf0992370946a681a22-41b9-421e-8f40-17de476e14d876909f1e-c673-4788-99a8-d6197a4577c17cf9ee96-6c50-40cc-82dc-fae79f08aec27daf95d7-4a24-42c9-8e3a-71908a21d13c8187e01b-a083-4149-95b9-e7f5794c420e84aca8ea-1108-4b18-bcdb-adecef5ecccb87630361-9101-4b75-b1f3-9f5b947be6cc95bdb13b-3e70-4bf3-8b84-c2a4ad1f9e4e9ea7a017-5ad2-425a-99f4-8c9496e413989f2e8e56-a2fb-497a-819f-385ce32ec0059f774f37-b4e7-4216-b654-c6d541b929b6a09aee56-5566-4ca4-80e4-743c033dd76da0cab3a7-672f-4b33-8261-ccb5ddeb38bca4e3767e-516a-4348-895d-f26a52a6b73cb9c5cc92-03d1-42cb-bdd1-25dfb503ce72c8c8fa50-6d5f-44d8-9cef-cb87ebd2a3daeff47cbf-b237-48fc-8441-8a9f5ccca30ff3f0db0a-92ad-491c-86f4-6679473c0217

Assessments

CVSS by origin

10.0

support@hackerone.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

10.0

hackeroneCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Direct CVE/CNA normalized decisions

10.0Priority eligible

hackerone

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Validation: Valid match
Recomputed: 10.0
Decision reason: Evidence supported
Policy: casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

KEV membership is authoritative for the catalog, not proof of exposure in any environment.
EPSS is a dated model probability and not an individual-environment prediction.
Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
OSV aggregation and OSV-converted NVD material are not independent corroboration.
Red Hat facts are vendor assertions for the exact supplied products.
Nonmembership and not-yet-observed states are not proof of safety.