CVE-2026-86698

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.

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Weakness Type (CWE)

CWE-613 CWE-613

References

Other References

https://cna.erlef.org/cves/CVE-2026-86698.html https://github.com/hexpm/hexpm/commit/650faa03af511e74c1b3b49ec12d35666b6984c4 https://github.com/hexpm/hexpm/commit/db58cf3a86c7639708ef52ff86de0b4f938e6360 https://github.com/hexpm/hexpm/security/advisories/GHSA-vmw7-7g2w-gw2f https://osv.dev/vulnerability/EEF-CVE-2026-86698 https://github.com/hexpm/hexpm/security/advisories/GHSA-vmw7-7g2w-gw2f

Frequently Asked Questions

What is CVE-2026-86698? +

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.

How do I check if I'm vulnerable to CVE-2026-86698? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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