What’s Vulnerable › Vulnerabilities

CVE-2021-46871

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-01-10 · updated 2026-06-17
• Weakness: CWE-79

Description

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

How to fix

Upgrade to a fixed version: phoenixframework Phoenix Html 3.0.4. Check the vendor advisory for mitigations.

References

• https://github.com/advisories/GHSA-j3gg-r6gp-95q2
• https://github.com/phoenixframework/phoenix_html/commit/62a0139fb716bcdce697f6221244bd81d321d620
• https://github.com/advisories/GHSA-j3gg-r6gp-95q2
• https://github.com/phoenixframework/phoenix_html/commit/62a0139fb716bcdce697f6221244bd81d321d620

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