CVE-2026-65635 (GCVE-0-2026-65635)
Vulnerability from cvelistv5 – Published: 2026-07-30 14:17 – Updated: 2026-07-31 04:20
VLAI
EPSS
VEX
Title
Boruta dynamic client registration allows creation of over-privileged OAuth clients
Summary
Improper Isolation or Compartmentalization vulnerability in malach-it boruta (Elixir.Boruta.Openid module) allows attackers to register OpenID Connect clients with administrative privileges through the dynamic client registration entry point. Boruta.Openid.register_client/3 forwards caller-supplied registration parameters to the administrative client creation path without a public/admin field-level allowlist, so an unauthenticated registrant can set security-sensitive attributes including supported grant types, authorized scopes, PKCE enforcement, public refresh and revocation behavior, token lifetimes, and signing settings. The library does not distinguish between metadata a public registrant is allowed to set and administrative controls that should require operator approval.
This vulnerability is associated with program files lib/boruta/openid.ex and program routines 'Elixir.Boruta.Openid':register_client/3, 'Elixir.Boruta.Openid':parse_registration_params/2.
This issue affects boruta from 2.3.0 before 2.3.7.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-30 16:13 UTC
CWE
- CWE-653 - Improper Isolation or Compartmentalization
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/malach-it/boruta_auth/security… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-65635.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-65635 | related |
| https://github.com/malach-it/boruta_auth/commit/8… | patch |
| https://github.com/malach-it/boruta_auth/commit/9… | patch |
Impacted products
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"lib/boruta/openid.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Boruta.Openid\u0027:register_client/3"
},
{
"name": "\u0027Elixir.Boruta.Openid\u0027:parse_registration_params/2"
}
],
"repo": "https://github.com/malach-it/boruta_auth",
"vendor": "malach-it",
"versions": [
{
"lessThan": "2.3.7",
"status": "affected",
"version": "2.3.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:malach-it:boruta:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"Elixir.Boruta.Openid"
],
"packageName": "malach-it/boruta_auth",
"packageURL": "pkg:github/malach-it/boruta_auth",
"product": "boruta",
"programFiles": [
"lib/boruta/openid.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Boruta.Openid\u0027:register_client/3"
},
{
"name": "\u0027Elixir.Boruta.Openid\u0027:parse_registration_params/2"
}
],
"repo": "https://github.com/malach-it/boruta_auth",
"vendor": "malach-it",
"versions": [
{
"changes": [
{
"at": "82584c854a332482232fd25301ab12a835f9f643",
"status": "unaffected"
},
{
"at": "95619a1beaff68fa766cca9b388e7c780d182525",
"status": "unaffected"
}
],
"lessThan": "*",
"status": "affected",
"version": "85481b706636fe68a43d0b8d3275e2afc7f7fee1",
"versionType": "git"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eA deployment is vulnerable when the host application exposes \u003ctt\u003eBoruta.Openid.register_client/3\u003c/tt\u003e on a network endpoint without requiring a trusted initial access token and without a strict server-side allowlist that prevents caller-supplied administrative attributes from reaching the underlying changeset. The standard controller generator does not install a dynamic client registration route, so deployments that never call \u003ctt\u003eBoruta.Openid.register_client/3\u003c/tt\u003e from a public endpoint are not exploitable.\u003c/p\u003e"
}
],
"value": "A deployment is vulnerable when the host application exposes Boruta.Openid.register_client/3 on a network endpoint without requiring a trusted initial access token and without a strict server-side allowlist that prevents caller-supplied administrative attributes from reaching the underlying changeset. The standard controller generator does not install a dynamic client registration route, so deployments that never call Boruta.Openid.register_client/3 from a public endpoint are not exploitable."
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:malach-it:boruta:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.3.7",
"versionStartIncluding": "2.3.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Pascal Knoth"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Pascal Knoth"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eImproper Isolation or Compartmentalization vulnerability in malach-it boruta (\u003ctt\u003eElixir.Boruta.Openid\u003c/tt\u003e module) allows attackers to register OpenID Connect clients with administrative privileges through the dynamic client registration entry point. \u003ctt\u003eBoruta.Openid.register_client/3\u003c/tt\u003e forwards caller-supplied registration parameters to the administrative client creation path without a public/admin field-level allowlist, so an unauthenticated registrant can set security-sensitive attributes including supported grant types, authorized scopes, PKCE enforcement, public refresh and revocation behavior, token lifetimes, and signing settings. The library does not distinguish between metadata a public registrant is allowed to set and administrative controls that should require operator approval.\u003c/p\u003e\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/boruta/openid.ex\u003c/tt\u003e and program routines \u003ctt\u003e\u0027Elixir.Boruta.Openid\u0027:register_client/3\u003c/tt\u003e, \u003ctt\u003e\u0027Elixir.Boruta.Openid\u0027:parse_registration_params/2\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects boruta from 2.3.0 before 2.3.7.\u003c/p\u003e"
}
],
"value": "Improper Isolation or Compartmentalization vulnerability in malach-it boruta (Elixir.Boruta.Openid module) allows attackers to register OpenID Connect clients with administrative privileges through the dynamic client registration entry point. Boruta.Openid.register_client/3 forwards caller-supplied registration parameters to the administrative client creation path without a public/admin field-level allowlist, so an unauthenticated registrant can set security-sensitive attributes including supported grant types, authorized scopes, PKCE enforcement, public refresh and revocation behavior, token lifetimes, and signing settings. The library does not distinguish between metadata a public registrant is allowed to set and administrative controls that should require operator approval.\n\nThis vulnerability is associated with program files lib/boruta/openid.ex and program routines \u0027Elixir.Boruta.Openid\u0027:register_client/3, \u0027Elixir.Boruta.Openid\u0027:parse_registration_params/2.\n\nThis issue affects boruta from 2.3.0 before 2.3.7."
}
],
"impacts": [
{
"capecId": "CAPEC-1",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 8.3,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "HIGH"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-653",
"description": "CWE-653 Improper Isolation or Compartmentalization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-31T04:20:15.914Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/malach-it/boruta_auth/security/advisories/GHSA-w869-fcf2-68vp"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-65635.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-65635"
},
{
"tags": [
"patch"
],
"url": "https://github.com/malach-it/boruta_auth/commit/82584c854a332482232fd25301ab12a835f9f643"
},
{
"tags": [
"patch"
],
"url": "https://github.com/malach-it/boruta_auth/commit/95619a1beaff68fa766cca9b388e7c780d182525"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Boruta dynamic client registration allows creation of over-privileged OAuth clients",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eDisable the dynamic client registration route or restrict it to authenticated administrators. If dynamic registration must remain available to untrusted callers, do not forward the request parameters to \u003ctt\u003eBoruta.Openid.register_client/3\u003c/tt\u003e directly. Instead, construct a new parameter map in the host application that contains only the standards-defined public metadata (such as redirect URIs, client name, logo, and contacts) and overwrite every administrative attribute (supported grant types, authorized scopes, PKCE flag, public refresh and revocation flags, token lifetimes, signing settings, token endpoint authentication method) with values from a fixed least-privilege server-side profile before calling the function.\u003c/p\u003e"
}
],
"value": "Disable the dynamic client registration route or restrict it to authenticated administrators. If dynamic registration must remain available to untrusted callers, do not forward the request parameters to Boruta.Openid.register_client/3 directly. Instead, construct a new parameter map in the host application that contains only the standards-defined public metadata (such as redirect URIs, client name, logo, and contacts) and overwrite every administrative attribute (supported grant types, authorized scopes, PKCE flag, public refresh and revocation flags, token lifetimes, signing settings, token endpoint authentication method) with values from a fixed least-privilege server-side profile before calling the function."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-65635",
"datePublished": "2026-07-30T14:17:02.942Z",
"dateReserved": "2026-07-22T13:58:26.233Z",
"dateUpdated": "2026-07-31T04:20:15.914Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.