FKIE_CVE-2026-75554

Vulnerability from fkie_nvd - Published: 2026-08-24 21:17 - Updated: 2026-08-24 21:17
Severity
2.3 (Low) - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
Summary
Insufficient Session Expiration vulnerability in the OAuth token refresh grant in hexpm hexpm allows a user removed from an organization to keep reading its private packages. expand_repositories_scope/3 in lib/hexpm/permissions.ex only rewrites the literal repositories scope, so an explicitly granted repository:<org> or docs:<org> scope passes through it untouched. The refresh grant re-derives a new token from the stored granted_scopes, which holds that expanded form, so every refresh reproduces the organization scope without revisiting membership. Because both CDN edges authorize repository access from the token claim without querying the database, an account removed from an organization retains read access for as long as it keeps refreshing, bounded by the 30 day refresh token lifetime rather than the 30 minute access token lifetime. This issue affects hex.pm: from 2025-10-10 before 2026-08-24.
References
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://cna.erlef.org/cves/CVE-2026-75554.html
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/hexpm/hexpm/commit/50cffd206490c49c92d7b63c8505949682abedb0
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/hexpm/hexpm/security/advisories/GHSA-24ww-j3f4-p49c
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://osv.dev/vulnerability/EEF-CVE-2026-75554
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://hex.pm",
          "cpes": [
            "cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Hexpm.Permissions\u0027",
            "\u0027Elixir.Hexpm.OAuth.Tokens\u0027",
            "\u0027Elixir.HexpmWeb.API.OAuthController\u0027"
          ],
          "packageName": "hex.pm",
          "product": "hexpm",
          "programFiles": [
            "lib/hexpm/permissions.ex",
            "lib/hexpm/oauth/tokens.ex",
            "lib/hexpm_web/controllers/api/oauth_controller.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Hexpm.Permissions\u0027:expand_repositories_scope/2"
            },
            {
              "name": "\u0027Elixir.Hexpm.OAuth.Tokens\u0027:create_for_user/6"
            },
            {
              "name": "\u0027Elixir.HexpmWeb.API.OAuthController\u0027:handle_refresh_token_grant/2"
            }
          ],
          "vendor": "hexpm",
          "versions": [
            {
              "lessThan": "2026-08-24",
              "status": "affected",
              "version": "2025-10-10",
              "versionType": "date"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Hexpm.Permissions\u0027",
            "\u0027Elixir.Hexpm.OAuth.Tokens\u0027",
            "\u0027Elixir.HexpmWeb.API.OAuthController\u0027"
          ],
          "packageName": "hexpm/hexpm",
          "packageURL": "pkg:github/hexpm/hexpm",
          "product": "hexpm",
          "programFiles": [
            "lib/hexpm/permissions.ex",
            "lib/hexpm/oauth/tokens.ex",
            "lib/hexpm_web/controllers/api/oauth_controller.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Hexpm.Permissions\u0027:expand_repositories_scope/2"
            },
            {
              "name": "\u0027Elixir.Hexpm.OAuth.Tokens\u0027:create_for_user/6"
            },
            {
              "name": "\u0027Elixir.HexpmWeb.API.OAuthController\u0027:handle_refresh_token_grant/2"
            }
          ],
          "repo": "https://github.com/hexpm/hexpm",
          "vendor": "hexpm",
          "versions": [
            {
              "lessThan": "50cffd206490c49c92d7b63c8505949682abedb0",
              "status": "affected",
              "version": "650faa03af511e74c1b3b49ec12d35666b6984c4",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Insufficient Session Expiration vulnerability in the OAuth token refresh grant in hexpm hexpm allows a user removed from an organization to keep reading its private packages.\n\nexpand_repositories_scope/3 in lib/hexpm/permissions.ex only rewrites the literal repositories scope, so an explicitly granted repository:\u003corg\u003e or docs:\u003corg\u003e scope passes through it untouched. The refresh grant re-derives a new token from the stored granted_scopes, which holds that expanded form, so every refresh reproduces the organization scope without revisiting membership. Because both CDN edges authorize repository access from the token claim without querying the database, an account removed from an organization retains read access for as long as it keeps refreshing, bounded by the 30 day refresh token lifetime rather than the 30 minute access token lifetime.\n\nThis issue affects hex.pm: from 2025-10-10 before 2026-08-24."
    }
  ],
  "id": "CVE-2026-75554",
  "lastModified": "2026-08-24T21:17:47.557",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.3,
          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-24T21:17:47.557",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-75554.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/hexpm/hexpm/commit/50cffd206490c49c92d7b63c8505949682abedb0"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/hexpm/hexpm/security/advisories/GHSA-24ww-j3f4-p49c"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-75554"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-613"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}



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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

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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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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.