Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-75554.html
- https://github.com/hexpm/hexpm/commit/50cffd206490c49c92d7b63c8505949682abedb0
- https://github.com/hexpm/hexpm/security/advisories/GHSA-24ww-j3f4-p49c
- https://osv.dev/vulnerability/EEF-CVE-2026-75554
- https://github.com/hexpm/hexpm/security/advisories/GHSA-24ww-j3f4-p49c
FAQ
What is CVE-2026-75554?
CVE-2026-75554 is a documented vulnerability. 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_scop...
How severe is CVE-2026-75554?
CVSS scoring is not yet available for CVE-2026-75554. Check NVD for updates.
Is there a patch for CVE-2026-75554?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.