XSS Vulnerability in Hexpm Product by Hexpm
CVE-2026-21618

8.5HIGH

Key Information:

Vendor

Hexpm

Status
Hexpm
Hex.pm
Vendor
CVE Published:
19 January 2026

What is CVE-2026-21618?

A vulnerability exists in Hexpm that allows for improper neutralization of input during web page generation, leading to potential Cross-Site Scripting (XSS) attacks. This issue affects specific versions of the Hexpm product, particularly in the 'Elixir.HexpmWeb.SharedAuthorizationView' module. It enables attackers to inject malicious scripts into web pages, compromising the security and integrity of web applications that utilize Hexpm. Users are urged to evaluate their versions and update accordingly to mitigate this risk.

Affected Version(s)

hex.pm 2025-10-01 < 2026-01-19

hexpm 617e44c71f1dd9043870205f371d375c5c4d886d

References

https://github.com/hexpm/hexpm/security/advisories/GHSA-6...
vendor-advisoryrelated
https://cna.erlef.org/cves/CVE-2026-21618.html
related
https://osv.dev/vulnerability/EEF-CVE-2026-21618
related

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Joud Zakharia / zentrust partners GmbH
Jonatan Männchen / EEF
Eric Meadows-Jönsson / Hex.pm
.