CVE-2026-86698

Refresh tokens accepted as private repository credentials at the CDN

CVSS 4.0 2.3 LOWCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-86698

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-86698

Published

hex.pm

https://hex.pm

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "collectionURL": "https://hex.pm",
                    "cpes": [
                        "cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.Hexpm.OAuth.JWT'",
                        "'Elixir.Hexpm.OAuth.Tokens'"
                    ],
                    "packageName": "hex.pm",
                    "product": "hexpm",
                    "programFiles": [
                        "lib/hexpm/oauth/jwt.ex",
                        "lib/hexpm/oauth/tokens.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.Hexpm.OAuth.JWT':generate_refresh_token/4"
                        },
                        {
                            "name": "'Elixir.Hexpm.OAuth.Tokens':create_for_user/6"
                        }
                    ],
                    "vendor": "hexpm",
                    "versions": [
                        {
                            "lessThan": "2026-09-22",
                            "status": "affected",
                            "version": "2025-10-10",
                            "versionType": "date"
                        }
                    ]
                }

hexpm/hexpm

https://github.com

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "collectionURL": "https://github.com",
                    "cpes": [
                        "cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.Hexpm.OAuth.JWT'",
                        "'Elixir.Hexpm.OAuth.Tokens'"
                    ],
                    "packageName": "hexpm/hexpm",
                    "packageURL": "pkg:github/hexpm/hexpm",
                    "product": "hexpm",
                    "programFiles": [
                        "lib/hexpm/oauth/jwt.ex",
                        "lib/hexpm/oauth/tokens.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.Hexpm.OAuth.JWT':generate_refresh_token/4"
                        },
                        {
                            "name": "'Elixir.Hexpm.OAuth.Tokens':create_for_user/6"
                        }
                    ],
                    "repo": "https://github.com/hexpm/hexpm",
                    "vendor": "hexpm",
                    "versions": [
                        {
                            "lessThan": "db58cf3a86c7639708ef52ff86de0b4f938e6360",
                            "status": "affected",
                            "version": "650faa03af511e74c1b3b49ec12d35666b6984c4",
                            "versionType": "git"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON