CVE-2026-47068 - Cross-session PubSub topic injection via URL parameter in phoenix_storybook

CVE-2026-47068 - Cross-session PubSub topic injection via URL parameter in phoenix_storybook

https://cvefeed.io/rssfeed/latest.atom / Wed, 05/20/2026 - 17:24
CVE ID :CVE-2026-47068
Published : May 20, 2026, 2:17 p.m. | 41 minutes ago
Description :Authorization Bypass Through User-Controlled Key vulnerability in phenixdigital phoenix_storybook allows cross-session PubSub topic injection via a URL query parameter. 'Elixir.PhoenixStorybook.Story.ComponentIframeLive':handle_params/3 in lib/phoenix_storybook/live/story/component_iframe_live.ex reads a PubSub topic directly from params["topic"] 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/?topic= causes their iframe process pid to be announced on the victim's topic. The victim's playground then addresses its private messages to the attacker's iframe process. This issue affects phoenix_storybook from 0.4.0 before 1.1.0.
Severity: 2.3 | LOW
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