---
id: CVE-2026-86698
title: >-
  Insufficient Session Expiration vulnerability in OAuth token issuance in hexpm
  hexpm allows a user whose organization membership or session has ended to keep
  reading the organization's private packages and their documentation tarballs
  vi…
summary: >-
  Insufficient Session Expiration vulnerability in OAuth token issuance in hexpm
  hexpm allows a user whose organization membership or session has ended to keep
  reading the organization's private packages and their documentation tarballs
  vi…
severity: low
cvss: 2.3
cvssVector: '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'
cwe:
  - CWE-613
vendor: hexpm
product: hex.pm
affected:
  - hex.pm >= 2025-10-10 < 2026-09-22
  - >-
    hexpm/hexpm >= 650faa03af511e74c1b3b49ec12d35666b6984c4 <
    db58cf3a86c7639708ef52ff86de0b4f938e6360
published: '2026-09-22'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:16:54.993'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86698'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-86698.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/hexpm/hexpm/commit/650faa03af511e74c1b3b49ec12d35666b6984c4
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/hexpm/hexpm/commit/db58cf3a86c7639708ef52ff86de0b4f938e6360
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://github.com/hexpm/hexpm/security/advisories/GHSA-vmw7-7g2w-gw2f'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-86698'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://github.com/hexpm/hexpm/security/advisories/GHSA-vmw7-7g2w-gw2f'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T18:05:56.100145Z'
cvssSource: cna
ingestedAt: '2026-09-22T16:06:00.473Z'
epss: 0.00427
epssPercentile: 0.34278
---

## Overview

Insufficient Session Expiration vulnerability in OAuth token issuance in hexpm hexpm allows a user whose organization membership or session has ended to keep reading the organization's private packages and their documentation tarballs via a retained refresh token.

generate_refresh_token/4 in lib/hexpm/oauth/jwt.ex signs the refresh token with the same iss, aud and scope claims as the access token, so it carries the same repository:<org> scopes. The CDN service that serves private repositories verifies the signature and time claims and then authorizes from the scope claim, with no database lookup and no way to tell the two token kinds apart. Removing a member or revoking a session therefore takes effect at the CDN only when the 30 day refresh token expires, instead of after the 30 minute access token lifetime. Access is read-only and limited to organizations the account belonged to when the token was granted.

This issue affects hex.pm: from 2025-10-10 before 2026-09-22.

## Remediation

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