Vulnerabilities in pkg:npm/workflow

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9r75-g2cr-3h76",
  "modified" : "2026-03-06T18:45:02Z",
  "published" : "2026-03-06T18:45:02Z",
  "aliases" : [ ],
  "summary" : "Vercel Workflow Allows Webhook Creation with Predictable User-Specified Tokens",
  "details" : "`createWebhook()` in Vercel Workflow DevKit accepts a user-specified `token` parameter that serves as the credential for the public webhook endpoint `/.well-known/workflow/v1/webhook/{token}`. Official documentation recommended predictable token patterns, making it possible for an unauthenticated remote attacker to guess the token and inject arbitrary payloads into the workflow execution context.\n\n#### Impact\n\nAn attacker who guesses a webhook token can resume the associated workflow with an attacker-controlled HTTP request body, potentially triggering downstream side effects such as API calls, database writes, or deployments.\n\n#### Fix\n\n* Upgrade to version 4.2.0-beta.64. The fix removes the `token` option from `createWebhook()` so that webhook tokens are always randomly generated by the SDK.\n* Runs created with versions prior to 4.2.0-beta.64, that are 1) still active (i.e. running), and 2) have open hooks, are still susceptible to this vulnerability. If users suspect the hook tokens are predictable or leaked - consider cancelling those runs and restarting them on the latest patch.\n\n#### Workarounds\n\nIn case a version upgrade is not possible, avoid passing predictable or guessable values to the `token` parameter of `createWebhook()`. Instead, users can either\n\n* switch from `createWebhook()` to `createHook()` instead and programmatically resume hooks using `resumeHook()` instead of the public webhook endpoint, or\n* use `createWebhook()` without passing a user-provided `token`, which uses a non-guessable random `nanoid` by default.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "workflow"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.2.0-beta.64"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.1.0-beta.63"
    }
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@workflow/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.2.0-beta.64"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.1.0-beta.63"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vercel/workflow/security/advisories/GHSA-9r75-g2cr-3h76"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vercel/workflow/commit/30e24d441e735635ffa4522198e6905d0e51e175"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vercel/workflow"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vercel/workflow/releases/tag/workflow%404.2.0-beta.64"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-06T18:45:02Z",
    "nvd_published_at" : null
  }
}