OAuth token exchange grants repository scopes for organizations the principal cannot access (CVE-2026-75542) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-75542

OAuth token exchange grants repository scopes for organizations the principal cannot access

Answer in brief

CVE-2026-75542 records a Unknown severity vulnerability in OAuth token exchange grants repository scopes for organizations the principal cannot access. The current sources do not mark it as known exploited. The current feed maps hexpm/hexpm (generic), hexpm/hexpm (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 24, 2026Updated Aug 24, 2026Source checked Aug 24, 2026First seen by HOL Aug 24, 2026Material review Aug 24, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps hexpm/hexpm (generic), hexpm/hexpm (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
hexpm/hexpmgeneric	>=2025-10-18 <2026-08-24	2026-08-24
hexpm/hexpmgeneric	>=71829cb6f6559bcceb1ef4e43a2fb8cdd3af654b <bf0fb9d208f0acfabf7a2f7467c8231659e322a8	bf0fb9d208f0acfabf7a2f7467c8231659e322a8

Recommended response

Check inventory. Check lockfiles and deployed manifests for hexpm/hexpm, hexpm/hexpm.
Review the reported fix. Update hexpm/hexpm to 2026-08-24; hexpm/hexpm to bf0fb9d208f0acfabf7a2f7467c8231659e322a8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 24, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.