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Advisory record · GHSA-55hg-8qxv-qj4p

Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground

CVSS 9.5 CriticalCriticalEPSS 0.021 · 81st percentile

Critical, because:

  • CVSS score 9.5: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 20 May 2026, 13:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
phoenix_storybookHex>=0.5.0, <1.1.01.1.0
Identifiers
GHSA-55hg-8qxv-qj4p · CVE-2026-8467 · EEF-CVE-2026-8467
Weakness (CWE)
CWE-94
Tags
Published
20 May 2026
Updated
30 Jul 2026

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.5 Critical 4.0 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 CNA (EEF)
  • CISA KEV Not listed.
  • EPSS 0.021, the 81st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:25 UTC First seen by agentprime
  2. 31 Oct 2026, 15:25 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.