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VulnerabilityPublished Updated

CVE-2026-8467: phenixdigital phoenix_storybook · Code Injection

Affects phenixdigital phoenix_storybookSource CVE Database V5

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Not known to be exploited · CVSS 9.5 Critical : upgrade to 1.1.0 as a priority.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 4.0 base score
9.5Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
2.1% chance of exploitation in 30 days – higher than 81% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.1.0, 56ab8464d4375fa52db806148a06cce126ad481d
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade phoenix_storybook and phenixdigital/phoenix_storybook to 1.1.0; phoenix_storybook to 56ab8464d4375fa52db806148a06cce126ad481d.

Affected software

ProductAffectedFixed in
phenixdigitalphoenix_storybookAffected
  • >=0.5.0 <1.1.0
Fixed in
  • 1.1.0
phenixdigitalphoenix_storybookAffected
  • ≥ e35379dfe2ef1a71b141899e36f431017c55265d, < 56ab8464d4375fa52db806148a06cce126ad481d
Fixed in
  • 56ab8464d4375fa52db806148a06cce126ad481d
Hexphenixdigital/phoenix_storybookpkg:hex/phenixdigital/phoenix_storybookOther threatsAffected
  • <1.1.0
Fixed in
  • 1.1.0
Hexphoenix_storybookpkg:hex/phoenix_storybookOther threatsAffected
  • >=0.5.0 <1.1.0
Fixed in
  • 1.1.0

CPE configurations (1)

  • cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, avoid exposing the vulnerable phoenix_storybook versions to untrusted networks or unauthenticated users. Do not rely on generic mitigations as the vulnerability specifically involves unsanitized HEEx template interpolation.

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.

Reports on CVE-2026-8467

References

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