---
id: CVE-2026-75542
title: >-
  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…
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…
severity: none
cwe:
  - CWE-863
published: '2026-08-24'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T21:10:00.227'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75542'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-75542.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/hexpm/hexpm/commit/bf0fb9d208f0acfabf7a2f7467c8231659e322a8
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://github.com/hexpm/hexpm/security/advisories/GHSA-rfx8-w654-8cpr'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-75542'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://github.com/hexpm/hexpm/security/advisories/GHSA-rfx8-w654-8cpr'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00465
epssPercentile: 0.38427
ingestedAt: '2026-10-12T22:05:40.345Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.