CVE-2026-86698 Details
Description
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.
A vulnerability in the OAuth token management of Hexpm, specifically in versions from 2025-10-10 prior to 2026-09-22, allows users to retain access to private organizational packages for up to 30 days after their membership or session has ended. This is due to refresh tokens being issued with the same scope claims as access tokens, which the CDN serving these private repositories accepts without distinction. The issue arises because the CDN does not consult the database for revocations, relying instead on the shorter access token lifespan. As a result, access granted by a refresh token can be exploited until it expires, bypassing the intended session management.
Users can update to the version containing the fix, which is db58cf3a86c7639708ef52ff86de0b4f938e6360.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 22, 2026CISA-ADP
Assessed Sep 22, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/hexpm/hexpm/security/advisories/GHSA-vmw7-7g2w-gw2f | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://cna.erlef.org/cves/CVE-2026-86698.html | EEF | AdvisoryExploit |
| https://github.com/hexpm/hexpm/commit/650faa03af511e74c1b3b49ec12d35666b6984c4 | EEF | Source CodeVendor |
| https://github.com/hexpm/hexpm/commit/db58cf3a86c7639708ef52ff86de0b4f938e6360 | EEF | Source CodeVendor |
| https://github.com/hexpm/hexpm/security/advisories/GHSA-vmw7-7g2w-gw2f | EEF | AdvisoryExploitRemedyVendor |
| https://osv.dev/vulnerability/EEF-CVE-2026-86698 | EEF | AdvisoryExploitTechnical Analysis |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-613 | Insufficient Session Expiration | EEF |
Affected Products
| Product | Versions |
|---|---|
| hexpm | >= 2025-10-10, < 2026-09-22 >= 650faa03af511e74c1b3b49ec12d35666b6984c4, < db58cf3a86c7639708ef52ff86de0b4f938e6360 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 22, 2026 | CVE Modified | CISA-ADP |
| Sep 22, 2026 | New CVE Received | EEF |