Refresh tokens accepted as private repository credentials at the CDN (CVE-2026-86698) | HOL Guard CVE

Low · CVSS 2.3CVE-2026-86698

Refresh tokens accepted as private repository credentials at the CDN

Answer in brief

CVE-2026-86698 records a Low severity (CVSS 2.3) vulnerability in Refresh tokens accepted as private repository credentials at the CDN. The current sources do not mark it as known exploited. The current feed maps hexpm/hexpm (generic), hexpm/hexpm (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: Low · CVSS 2.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 2.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps hexpm/hexpm (generic), hexpm/hexpm (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
hexpm/hexpmgeneric	>=2025-10-10 <2026-09-22	2026-09-22
hexpm/hexpmgeneric	>=650faa03af511e74c1b3b49ec12d35666b6984c4 <db58cf3a86c7639708ef52ff86de0b4f938e6360	db58cf3a86c7639708ef52ff86de0b4f938e6360

Recommended response

Check inventory. Check lockfiles and deployed manifests for hexpm/hexpm, hexpm/hexpm.
Review the reported fix. Update hexpm/hexpm to 2026-09-22; hexpm/hexpm to db58cf3a86c7639708ef52ff86de0b4f938e6360 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.