CVE-2026-21618
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk12th percentile - higher than 12% of all known CVEs
Summary
hexpm (hex.pm) has a Cross-Site Scripting (XSS) vulnerability in the Elixir.HexpmWeb.SharedAuthorizationView module. The render_grouped_scopes/3 function does not sanitize input, allowing script injection.
Risk Assessment
An attacker can inject malicious script that executes in the victim's browser, leading to session or data theft.
Recommendation
Update hexpm to a version containing the fix (commit c692438684ead90c3bcbfb9ccf4e63c768c668a8 or later).
Other vulnerabilities in hexpm
See all- CVE-2026-86698Low
hexpm (hex.pm) has a vulnerability of insufficient session expiration in OAuth tokens. A user whose organization membership or session has ended can still read the organization's private packages and documentation via a retained refresh token. Access is read-only and limited to organizations the account belonged to when the token was granted.
- CVE-2026-75554Low
hexpm (hex.pm) has a vulnerability due to insufficient session expiration in the OAuth token refresh grant. A user removed from an organization can still read private packages because permission scopes are not properly updated. Affects hex.pm from 2025-10-10 before 2026-08-24.
- CVE-2026-75542High
An incorrect authorization vulnerability in the OAuth token endpoint in hexpm allows an API key with the repositories permission to read another organization's private packages. During key exchange for a token, scope validation does not resolve the organization name against the principal, and repository:<name> scope passes through unchanged. The token grants read access to that organization's private packages until expiration.
Original NVD description (English source)
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in hexpm hexpm/hexpm ('Elixir.HexpmWeb.SharedAuthorizationView' modules) allows Cross-Site Scripting (XSS). This vulnerability is associated with program files lib/hexpm_web/views/shared_authorization_view.ex and program routines 'Elixir.HexpmWeb.SharedAuthorizationView':render_grouped_scopes/3. This issue affects hexpm: from 617e44c71f1dd9043870205f371d375c5c4d886d before c692438684ead90c3bcbfb9ccf4e63c768c668a8; hex.pm: from 2025-10-01 before 2026-01-19.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS