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CVE-2026-8467— Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground

Quick assessment

Affected
phenixdigital phoenix_storybook
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PhoenixStorybook是Phenix Digital开源的一个组件展示与交互调试的UI工具。 PhoenixStorybook 0.5.0版本至1.1.0之前版本存在代码注入漏洞，该漏洞源于未清理的属性值插值导致HEEx模板生成中代码注入，可能使未经验证的攻击者实现远程代码执行。

AI Predicted 9.8 Difficulty: Easy EPSS 2.06% · P81

Affected Version Matrix 2

VendorProduct Version RangeStatus
phenixdigital phoenix_storybook 0.5.0< 1.1.0 affected
e35379dfe2ef1a71b141899e36f431017c55265d< 56ab8464d4375fa52db806148a06cce126ad481d affected
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I. Basic Information for CVE-2026-8467

Vulnerability Information
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Vulnerability Title
Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground
Source: CVE Program / CVE List V5
Vulnerability Description
Code Injection vulnerability in phenixdigital phoenix_storybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation. The psb-assign WebSocket event handler in 'Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive':handle_event/3 accepts arbitrary attribute names and values from unauthenticated clients. These values are passed to 'Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers':handle_set_variation_assign/3, which stores them verbatim. When rendering, 'Elixir.PhoenixStorybook.Rendering.ComponentRenderer':attributes_markup/1 interpolates binary attribute values directly into a HEEx template string as name="<val>" 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" injected={EXPR} bar="), 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. This issue affects phoenix_storybook from 0.5.0 before 1.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
PhoenixStorybook 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PhoenixStorybook是Phenix Digital开源的一个组件展示与交互调试的UI工具。 PhoenixStorybook 0.5.0版本至1.1.0之前版本存在代码注入漏洞，该漏洞源于未清理的属性值插值导致HEEx模板生成中代码注入，可能使未经验证的攻击者实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
phenixdigital phoenix_storybook 0.5.0 ~ 1.1.0 cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*
phenixdigital phoenix_storybook e35379dfe2ef1a71b141899e36f431017c55265d ~ 56ab8464d4375fa52db806148a06cce126ad481d cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-8467

# POC Description Source Link Shenlong Link
1 Phenixdigital phoenix_storybook >=0.5.0 <1.1.0 contains a code injection caused by unsanitized attribute value interpolation in HEEx template generation, letting unauthenticated remote attackers execute arbitrary code on the server, exploit requires sending crafted WebSocket event data. https://github.com/projectdiscovery/nuclei-templates/blob/main/code/cves/2026/CVE-2026-8467.yaml POC Details
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III. Intelligence Information for CVE-2026-8467

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Patches & Fixes for CVE-2026-8467 (1)

Vendor Advisories for CVE-2026-8467 (3)

Same Patch Batch · phenixdigital · 2026-05-20 · 3 CVEs total

CVE-2026-47068 Cross-session PubSub topic injection via URL parameter in phoenix_storybook
CVE-2026-8469 Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook

IV. Related Vulnerabilities

Same product: phoenix_storybook
Same vendor: phenixdigital
Same weakness: CWE-94

V. Comments for CVE-2026-8467

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