Is CVE-2026-8467 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-8467 being exploited in the wild.

How severe is CVE-2026-8467?

Critical severity, with a CVSS score of 9.5, published 20 May 2026.

Which products and versions are affected?

Phenix Digital Storybook 0.5.0 to 1.0.x (fixed in 1.1.0).

Is there a fix for CVE-2026-8467?

A patch was published on 2026-06-09: Version 1.1.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-8467 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-8467?

Check whether you run Phenix Digital Storybook at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-8467: phenixdigital phoenix_storybook code injection in playground rendering

CVE-2026-8467 · Severity: critical · CVSS 9.5 · Published 2026-05-20

PhoenixStorybook is a tool used by developers to showcase and test UI components in Elixir-based web applications. A critical security flaw in its "playground" feature allows any user on the internet to execute arbitrary commands on the server without needing a password. This could lead to a complete takeover of the server, theft of sensitive data, or disruption of services.

Technologies: Phenix Digital Storybook. Vendors: Phenix Digital.

Quick answers

Is CVE-2026-8467 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-8467 being exploited in the wild.
How severe is CVE-2026-8467?: Critical severity, with a CVSS score of 9.5, published 20 May 2026.
Which products and versions are affected?: Phenix Digital Storybook 0.5.0 to 1.0.x (fixed in 1.1.0).
Is there a fix for CVE-2026-8467?: A patch was published on 2026-06-09: Version 1.1.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-8467 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-8467?: Check whether you run Phenix Digital Storybook at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A remote code execution (RCE) vulnerability exists in phoenix_storybook versions 0.5.0 through 1.0.x. The flaw is located in the `psb-assign` event handler within `PhoenixStorybook.Story.PlaygroundPreviewLive`, which accepts unsanitized attribute values from WebSocket clients. These values are interpolated directly into a HEEx template string in `ComponentRenderer.attributes_markup/1` without escaping. Because the resulting template is compiled and evaluated using `Code.eval_quoted_with_env/3` with full Elixir `Kernel` access and no sandboxing, an attacker can inject arbitrary Elixir expressions (e.g., `System.cmd/2`) to execute operating system commands. The vulnerability is patched in version 1.1.0.

Affected products

phenixdigital phoenix_storybook >= 0.5.0, < 1.1.0

Identifiers

CVE-2026-8467
GHSA-55hg-8qxv-qj4p

Timeline

2026-05-20: disclosed
2026-06-09: advisory: GitHub Advisory published
2026-06-09: patched: Version 1.1.0 released

References

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