Vulnerability · Published Jan 19, 2026 · Assigned by EEF

CVE-2026-21618Cross-site scripting (XSS) in OAuth Device Authorization screen

High 8.5

In plain English

A high-severity cross-site scripting in hex.pm from hexpm. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 4.0)8.5High

Exploit odds (30 days)0.3%top 82.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
hexpm	hexpm	617e44c71f1dd9043870205f371d375c5c4d886d – before c692438684ead90c3bcbfb9ccf4e63c768c668a8
hexpm	hex.pm	2025-10-01 – before 2026-01-19

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

References

https://github.com/hexpm/hexpm/security/advisories/GHSA-6cw9-5gg4-rhpj vendor-advisory, related
https://cna.erlef.org/cves/CVE-2026-21618.html related
https://osv.dev/vulnerability/EEF-CVE-2026-21618 related
https://github.com/hexpm/hexpm/commit/c692438684ead90c3bcbfb9ccf4e63c768c668a8 patch