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TI-2026-34670 Aliases CVE-2026-47068GHSA-mrhx-6pw9-q5fh

Cross-session PubSub topic injection via URL parameter in phoenix_storybook

Priority MEDIUM 51CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-639.

Summary

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/<story>?topic=<victim_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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00449 39th percentileScored 2026-11-07
Fix Fixed phoenix_storybook (phenixdigital): 1.1.0phoenix_storybook (Hex): 1.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
phenixdigitalphoenix_storybook0.4.0 to before 1.1.01.1.0Patch availableCNA
—phoenix_storybook (Hex)0.4.0 to before 1.1.01.1.0Patch availableGHSA-mrhx-6pw9-q5fh
  • phoenix_storybook Vendorphenixdigital Affected 0.4.0 to before 1.1.0 Fixed in 1.1.0 Patch available CNA
  • phoenix_storybook (Hex) Vendor— Affected 0.4.0 to before 1.1.0 Fixed in 1.1.0 Patch available GHSA-mrhx-6pw9-q5fh

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*——phenixdigital
  • cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:* Versions — — ·phenixdigital

Remediation

  • Fix · CNA phoenix_storybook (phenixdigital) Fixed in 1.1.0
  • Fix · GHSA-mrhx-6pw9-q5fh phoenix_storybook (Hex) Fixed in 1.1.0 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    phenixdigital phoenix_storybook 1.1.0

    3 records Highest priority Priority HIGH 2 HIGH, 1 MEDIUM

    Other records, highest priority first

    • TI-2026-07436 Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playgroundPriority HIGH 82
    • TI-2026-07438 Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybookPriority HIGH 75
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-47068
  2. 2026-10-03 Alias added: GHSA-mrhx-6pw9-q5fh

References

Patch 1

Advisory 2

Other 3

  • TI-2026-07436 Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground CVSS 4.0CRITICAL 9.5
  • TI-2026-07438 Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook CVSS 4.0HIGH 8.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences