CVE-2026-75542

Severity CVSS v4.0:

HIGH

Type:

Unavailable / Other

Publication date:

24/08/2026

Last modified:

25/08/2026

Description

Incorrect Authorization vulnerability in the OAuth token endpoint in hexpm hexpm allows an API key holding the repositories permission to read another organization&#39;s private packages.<br /> <br /> 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: 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&#39;s private packages until it expires.<br /> <br /> This issue affects hex.pm: from 2025-10-18 before 2026-08-24.

Impact

Vector 4.0

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 CVSS v4.0 Severity and Metrics:

Base Score: 8.30 HIGH
Vector: 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

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): Low
User Interaction (UI): None
Confidentiality (VC): High
Integrity (VI): None
Availability (VA): None
Confidentiality (SC): High
Integrity (SI): None
Availability (SA): None

Base Score 4.0

8.30

Severity 4.0

HIGH

CVE-2026-75542

Description

Impact

References to Advisories, Solutions, and Tools