CVE-2026-8467 (GCVE-0-2026-8467)

Vulnerability from cvelistv5 – Published: 2026-05-20 13:35 – Updated: 2026-05-27 15:41
VLAI
Title
Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground
Summary
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.
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-21 13:57 UTC
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
Assigner
EEF CNA
Impacted products
Vendor Product Version
phenixdigital phoenix_storybook Affected: 0.5.0 , < 1.1.0 (semver)
    cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*
Create a notification for this product.
phenixdigital phoenix_storybook Affected: e35379dfe2ef1a71b141899e36f431017c55265d , < 56ab8464d4375fa52db806148a06cce126ad481d (git)
    cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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                "related"
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              "url": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-55hg-8qxv-qj4p"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://cna.erlef.org/cves/CVE-2026-8467.html"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://osv.dev/vulnerability/EEF-CVE-2026-8467"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/phenixdigital/phoenix_storybook/commit/56ab8464d4375fa52db806148a06cce126ad481d"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground",
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "assignerShortName": "EEF",
        "cveId": "CVE-2026-8467",
        "datePublished": "2026-05-20T13:35:29.018Z",
        "dateReserved": "2026-05-13T11:44:40.790Z",
        "dateUpdated": "2026-05-27T15:41:02.357Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.