CVE-2026-75542 (GCVE-0-2026-75542)
Vulnerability from cvelistv5 – Published: 2026-08-24 20:14 – Updated: 2026-08-25 19:53
VLAI
EPSS
VEX
Title
OAuth token exchange grants repository scopes for organizations the principal cannot access
Summary
Incorrect Authorization vulnerability in the OAuth token endpoint in hexpm hexpm allows an API key holding the repositories permission to read another organization's private packages.
When an API key is exchanged for a token through the OAuth client_credentials grant, validate_scopes_against_key/2 in lib/hexpm_web/controllers/api/oauth_controller.ex admits a requested scope whenever the key carries the repositories permission and the scope string begins with repository:. The organization name is never resolved against the principal, and expand_repositories_scope/3 only rewrites the literal repositories scope, so an explicit repository:<name> passes through untouched. Both CDN edges authorize repository access from the token claim without querying the database, so the minted token is read access to that organization's private packages until it expires.
This issue affects hex.pm: from 2025-10-18 before 2026-08-24.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 19:53 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/hexpm/hexpm/security/advisorie… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-75542.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-75542 | related |
| https://github.com/hexpm/hexpm/commit/bf0fb9d208f… | patch |
Impacted products
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"value": "\u003cp\u003eIncorrect Authorization vulnerability in the OAuth token endpoint in hexpm hexpm allows an API key holding the \u003ccode\u003erepositories\u003c/code\u003e permission to read another organization\u0027s private packages.\u003c/p\u003e\n\u003cp\u003eWhen an API key is exchanged for a token through the OAuth \u003ccode\u003eclient_credentials\u003c/code\u003e grant, \u003ccode\u003evalidate_scopes_against_key/2\u003c/code\u003e in \u003ccode\u003elib/hexpm_web/controllers/api/oauth_controller.ex\u003c/code\u003e admits a requested scope whenever the key carries the \u003ccode\u003erepositories\u003c/code\u003e permission and the scope string begins with \u003ccode\u003erepository:\u003c/code\u003e. The organization name is never resolved against the principal, and \u003ccode\u003eexpand_repositories_scope/3\u003c/code\u003e only rewrites the literal \u003ccode\u003erepositories\u003c/code\u003e scope, so an explicit \u003ccode\u003erepository:\u0026lt;name\u0026gt;\u003c/code\u003e passes through untouched. Both CDN edges authorize repository access from the token claim without querying the database, so the minted token is read access to that organization\u0027s private packages until it expires.\u003c/p\u003e\n\u003cp\u003eThis issue affects hex.pm: from 2025-10-18 before 2026-08-24.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Incorrect Authorization vulnerability in the OAuth token endpoint in hexpm hexpm allows an API key holding the `repositories` permission to read another organization\u0027s private packages.\n\nWhen an API key is exchanged for a token through the OAuth `client_credentials` grant, `validate_scopes_against_key/2` in `lib/hexpm_web/controllers/api/oauth_controller.ex` admits a requested scope whenever the key carries the `repositories` permission and the scope string begins with `repository:`. The organization name is never resolved against the principal, and `expand_repositories_scope/3` only rewrites the literal `repositories` scope, so an explicit `repository:\u003cname\u003e` passes through untouched. Both CDN edges authorize repository access from the token claim without querying the database, so the minted token is read access to that organization\u0027s private packages until it expires.\n\nThis issue affects hex.pm: from 2025-10-18 before 2026-08-24."
}
],
"value": "Incorrect Authorization vulnerability in the OAuth token endpoint in hexpm hexpm allows an API key holding the repositories permission to read another organization\u0027s private packages.\n\nWhen an API key is exchanged for a token through the OAuth client_credentials grant, validate_scopes_against_key/2 in lib/hexpm_web/controllers/api/oauth_controller.ex admits a requested scope whenever the key carries the repositories permission and the scope string begins with repository:. The organization name is never resolved against the principal, and expand_repositories_scope/3 only rewrites the literal repositories scope, so an explicit repository:\u003cname\u003e passes through untouched. Both CDN edges authorize repository access from the token claim without querying the database, so the minted token is read access to that organization\u0027s private packages until it expires.\n\nThis issue affects hex.pm: from 2025-10-18 before 2026-08-24."
}
],
"impacts": [
{
"capecId": "CAPEC-122",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-122 Privilege Abuse"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.3,
"baseSeverity": "HIGH",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-863",
"description": "CWE-863 Incorrect Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-24T20:14:30.191Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/hexpm/hexpm/security/advisories/GHSA-rfx8-w654-8cpr"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-75542.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-75542"
},
{
"tags": [
"patch"
],
"url": "https://github.com/hexpm/hexpm/commit/bf0fb9d208f0acfabf7a2f7467c8231659e322a8"
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "OAuth token exchange grants repository scopes for organizations the principal cannot access"
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-75542",
"datePublished": "2026-08-24T20:14:30.191Z",
"dateReserved": "2026-08-18T11:00:02.414Z",
"dateUpdated": "2026-08-25T19:53:26.196Z",
"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.
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- 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.