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      <title>CVE-2026-47068 — Cross-session PubSub topic injection via URL parameter in phoenix_storybook</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-47068</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; phenixdigital phoenix_storybook&lt;/p&gt;
&lt;p&gt;Authorization Bypass Through User-Controlled Key vulnerability in phenixdigital phoenix_storybook allows cross-session PubSub topic injection via a URL query parameter.&lt;/p&gt;
&lt;p&gt;&amp;#39;Elixir.PhoenixStorybook.Story.ComponentIframeLive&amp;#39;:handle_params/3 in lib/phoenix_storybook/live/story/component_iframe_live.ex reads a PubSub topic directly from params[&amp;#34;topic&amp;#34;] and broadcasts {:component_iframe_pid, self()} on it with no check that the topic belongs to the requesting session. The shared PhoenixStorybook.PubSub is used to coordinate playground LiveViews with their iframes: a playground subscribes to a session-specific topic and uses the received iframe pid to direct subsequent control messages (variation state, theme switches, extra-assign payloads) via send/2. Because the iframe trusts the query parameter, an attacker who loads /storybook/iframe/&amp;lt;story&amp;gt;?topic=&amp;lt;victim_topic&amp;gt; causes their iframe process pid to be announced on the victim&amp;#39;s topic. The victim&amp;#39;s playground then addresses its private messages to the attacker&amp;#39;s iframe process.&lt;/p&gt;
&lt;p&gt;This issue affects phoenix_storybook from 0.4.0 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;Authorization Bypass Through User-Controlled Key vulnerability in phenixdigital phoenix_storybook allows cross-session PubSub topic injection via a URL query parameter.&lt;/p&gt;
&lt;p&gt;&amp;#39;Elixir.PhoenixStorybook.Story.ComponentIframeLive&amp;#39;:handle_params/3 in lib/phoenix_storybook/live/story/component_iframe_live.ex reads a PubSub topic directly from params[&amp;#34;topic&amp;#34;] and broadcasts {:component_iframe_pid, self()} on it with no check that the topic belongs to the requesting session. The shared PhoenixStorybook.PubSub is used to coordinate playground LiveViews with their iframes: a playground subscribes to a session-specific topic and uses the received iframe pid to direct subsequent control messages (variation state, theme switches, extra-assign payloads) via send/2. Because the iframe trusts the query parameter, an attacker who loads /storybook/iframe/&amp;lt;story&amp;gt;?topic=&amp;lt;victim_topic&amp;gt; causes their iframe process pid to be announced on the victim&amp;#39;s topic. The victim&amp;#39;s playground then addresses its private messages to the attacker&amp;#39;s iframe process.&lt;/p&gt;
&lt;p&gt;This issue affects phoenix_storybook from 0.4.0 before 1.1.0.&lt;/p&gt;</content:encoded>
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