AIKIDO-2026-73591
phoenix_html is vulnerable to Cross-site Scripting
53
CVE Score
Medium
Cross-site Scripting
TL;DR
An attacker who supplied attribute names could inject attributes and script into rendered HTML because attributes_escape/1 escaped values but not names. The issue mattered when an application built attribute keys from untrusted input and rendered them through HEEx, content_tag/3, or a direct call. The fix corrected the issue in the patched releases.
How do I fix this?
Upgrade the phoenix_html package to a fixed release on your branch: 3.3.5, 4.4.0.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range of phoenix_html.
Package
Versions
1.0.0 - 3.3.4
Fixed in 3.3.54.0.0 - 4.3.0
Fixed in 4.4.0Background info
phoenix_html is vulnerable to Cross-site Scripting in versions 1.0.0 - 3.3.4 and 4.0.0 - 4.3.0.
Links
CVE Detail
Fix Commits
github.com/phoenixframework/phoenix_html/commit/6ad3a1d7960891a468d54636054a98e11dfb5111github.com/phoenixframework/phoenix_html/commit/a47dc8944a773b7e9273d9691dc6744ec793f1degithub.com/phoenixframework/phoenix_html/commit/d9e4e6b2d9be49e25fb6d6b4fdbb2008174f01a6
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