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      <title>CVE-2026-8467 — Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-8467</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; phenixdigital phoenix_storybook&lt;/p&gt;
&lt;p&gt;Code Injection vulnerability in phenixdigital phoenix_storybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation.&lt;/p&gt;
&lt;p&gt;The psb-assign WebSocket event handler in &amp;#39;Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive&amp;#39;:handle_event/3 accepts arbitrary attribute names and values from unauthenticated clients. These values are passed to &amp;#39;Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers&amp;#39;:handle_set_variation_assign/3, which stores them verbatim. When rendering, &amp;#39;Elixir.PhoenixStorybook.Rendering.ComponentRenderer&amp;#39;:attributes_markup/1 interpolates binary attribute values directly into a HEEx template string as name=&amp;#34;&amp;lt;val&amp;gt;&amp;#34; without escaping double quotes or HEEx expression delimiters. An attacker can supply a value containing a closing quote followed by a HEEx expression block (e.g. foo&amp;#34; injected={EXPR} bar=&amp;#34;), which causes EXPR to be treated as an inline Elixir expression. The resulting template is compiled via EEx.compile_string/2 and executed via Code.eval_quoted_with_env/3 with full Kernel imports and no sandbox, giving the attacker arbitrary code execution on the server.&lt;/p&gt;
&lt;p&gt;This issue affects phoenix_storybook from 0.5.0 before 1.1.0.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; phenixdigital phoenix_storybook&lt;/p&gt;
&lt;p&gt;Code Injection vulnerability in phenixdigital phoenix_storybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation.&lt;/p&gt;
&lt;p&gt;The psb-assign WebSocket event handler in &amp;#39;Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive&amp;#39;:handle_event/3 accepts arbitrary attribute names and values from unauthenticated clients. These values are passed to &amp;#39;Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers&amp;#39;:handle_set_variation_assign/3, which stores them verbatim. When rendering, &amp;#39;Elixir.PhoenixStorybook.Rendering.ComponentRenderer&amp;#39;:attributes_markup/1 interpolates binary attribute values directly into a HEEx template string as name=&amp;#34;&amp;lt;val&amp;gt;&amp;#34; without escaping double quotes or HEEx expression delimiters. An attacker can supply a value containing a closing quote followed by a HEEx expression block (e.g. foo&amp;#34; injected={EXPR} bar=&amp;#34;), which causes EXPR to be treated as an inline Elixir expression. The resulting template is compiled via EEx.compile_string/2 and executed via Code.eval_quoted_with_env/3 with full Kernel imports and no sandbox, giving the attacker arbitrary code execution on the server.&lt;/p&gt;
&lt;p&gt;This issue affects phoenix_storybook from 0.5.0 before 1.1.0.&lt;/p&gt;</content:encoded>
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