CVE-2021-46871: Phoenixframework Phoenix Html

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

tag.ex in Phoenix Phoenix.HTML (aka phoenix_html) before 3.0.4 allows XSS in HEEx class attributes.

Affected products

• Phoenixframework Phoenix Html: before 3.0.4 (fixed in 3.0.4)

Published 2023-01-10. Last modified 2026-06-17.