Vulnerability-Lookup

CVE-2026-75542 (GCVE-0-2026-75542)

Vulnerability from cvelistv5 – Published: 2026-08-24 20:14 – Updated: 2026-08-24 20:14

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

8.3 (High)


                        
                          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

CWE

CWE-863 - Incorrect Authorization

Assigner

EEF mitre root

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

2 products

Vendor	Product	Version	CPE status
hexpm	hexpm	Affected: 2025-10-18 , < 2026-08-24 (date) cpe:2.3:a:hexpm:hexpm::::::::
hexpm	hexpm	Affected: 71829cb6f6559bcceb1ef4e43a2fb8cdd3af654b , < bf0fb9d208f0acfabf7a2f7467c8231659e322a8 (git) cpe:2.3:a:hexpm:hexpm::::::::

Credits

Eric Meadows-Jönsson Eric Meadows-Jönsson Jonatan Männchen / EEF

Show details on NVD website

JSON

To clipboard

{
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        {
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            "cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*"
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              "status": "affected",
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          "type": "finder",
          "value": "Eric Meadows-J\u00f6nsson"
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          "type": "remediation developer",
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        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Jonatan M\u00e4nnchen / EEF"
        }
      ],
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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"
            },
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              "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."
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          "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."
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        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
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        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "OAuth token exchange grants repository scopes for organizations the principal cannot access"
    }
  },
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    "datePublished": "2026-08-24T20:14:30.191Z",
    "dateReserved": "2026-08-18T11:00:02.414Z",
    "dateUpdated": "2026-08-24T20:14:30.191Z",
    "state": "PUBLISHED"
  },
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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.\"}],\"affected\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"affectedData\":[{\"vendor\":\"hexpm\",\"product\":\"hexpm\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://hex.pm\",\"packageName\":\"hex.pm\",\"cpes\":[\"cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.HexpmWeb.API.OAuthController\u0027\",\"\u0027Elixir.Hexpm.OAuth.Tokens\u0027\"],\"programFiles\":[\"lib/hexpm_web/controllers/api/oauth_controller.ex\",\"lib/hexpm/oauth/tokens.ex\"],\"programRoutines\":[{\"name\":\"\u0027Elixir.HexpmWeb.API.OAuthController\u0027:validate_scopes_against_key/2\"},{\"name\":\"\u0027Elixir.Hexpm.OAuth.Tokens\u0027:create_for_org/6\"}],\"versions\":[{\"version\":\"2025-10-18\",\"lessThan\":\"2026-08-24\",\"versionType\":\"date\",\"status\":\"affected\"}]},{\"vendor\":\"hexpm\",\"product\":\"hexpm\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://github.com\",\"packageName\":\"hexpm/hexpm\",\"cpes\":[\"cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.HexpmWeb.API.OAuthController\u0027\",\"\u0027Elixir.Hexpm.OAuth.Tokens\u0027\"],\"programFiles\":[\"lib/hexpm_web/controllers/api/oauth_controller.ex\",\"lib/hexpm/oauth/tokens.ex\"],\"programRoutines\":[{\"name\":\"\u0027Elixir.HexpmWeb.API.OAuthController\u0027:validate_scopes_against_key/2\"},{\"name\":\"\u0027Elixir.Hexpm.OAuth.Tokens\u0027:create_for_org/6\"}],\"repo\":\"https://github.com/hexpm/hexpm\",\"packageURL\":\"pkg:github/hexpm/hexpm\",\"versions\":[{\"version\":\"71829cb6f6559bcceb1ef4e43a2fb8cdd3af654b\",\"lessThan\":\"bf0fb9d208f0acfabf7a2f7467c8231659e322a8\",\"versionType\":\"git\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":8.3,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"HIGH\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"HIGH\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-863\"}]}],\"references\":[{\"url\":\"https://cna.erlef.org/cves/CVE-2026-75542.html\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/hexpm/hexpm/commit/bf0fb9d208f0acfabf7a2f7467c8231659e322a8\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/hexpm/hexpm/security/advisories/GHSA-rfx8-w654-8cpr\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://osv.dev/vulnerability/EEF-CVE-2026-75542\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"}]}}"
  }
}

FKIE_CVE-2026-75542

Vulnerability from fkie_nvd - Published: 2026-08-24 21:17 - Updated: 2026-08-24 21:17

Severity

8.3 (High) - 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

Summary

References

	URL	Tags
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://cna.erlef.org/cves/CVE-2026-75542.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/hexpm/hexpm/commit/bf0fb9d208f0acfabf7a2f7467c8231659e322a8
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/hexpm/hexpm/security/advisories/GHSA-rfx8-w654-8cpr
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-75542

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://hex.pm",
          "cpes": [
            "cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.HexpmWeb.API.OAuthController\u0027",
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          ],
          "packageName": "hex.pm",
          "product": "hexpm",
          "programFiles": [
            "lib/hexpm_web/controllers/api/oauth_controller.ex",
            "lib/hexpm/oauth/tokens.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.HexpmWeb.API.OAuthController\u0027:validate_scopes_against_key/2"
            },
            {
              "name": "\u0027Elixir.Hexpm.OAuth.Tokens\u0027:create_for_org/6"
            }
          ],
          "vendor": "hexpm",
          "versions": [
            {
              "lessThan": "2026-08-24",
              "status": "affected",
              "version": "2025-10-18",
              "versionType": "date"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.HexpmWeb.API.OAuthController\u0027",
            "\u0027Elixir.Hexpm.OAuth.Tokens\u0027"
          ],
          "packageName": "hexpm/hexpm",
          "packageURL": "pkg:github/hexpm/hexpm",
          "product": "hexpm",
          "programFiles": [
            "lib/hexpm_web/controllers/api/oauth_controller.ex",
            "lib/hexpm/oauth/tokens.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.HexpmWeb.API.OAuthController\u0027:validate_scopes_against_key/2"
            },
            {
              "name": "\u0027Elixir.Hexpm.OAuth.Tokens\u0027:create_for_org/6"
            }
          ],
          "repo": "https://github.com/hexpm/hexpm",
          "vendor": "hexpm",
          "versions": [
            {
              "lessThan": "bf0fb9d208f0acfabf7a2f7467c8231659e322a8",
              "status": "affected",
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              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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."
    }
  ],
  "id": "CVE-2026-75542",
  "lastModified": "2026-08-24T21:17:47.373",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
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          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
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          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.3,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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          "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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          "vulnConfidentialityImpact": "HIGH",
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          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-24T21:17:47.373",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-75542.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/hexpm/hexpm/commit/bf0fb9d208f0acfabf7a2f7467c8231659e322a8"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/hexpm/hexpm/security/advisories/GHSA-rfx8-w654-8cpr"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-75542"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2026-75542 (GCVE-0-2026-75542)

FKIE_CVE-2026-75542

Tags

Sightings

Nomenclature